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Lindy effect - Wikipedia
The Lindy effect is a theory that the future life expectancy of some non-perishable things like a technology or an idea is proportional to their current age, so that every additional period of survival implies a longer remaining life expectancy.[1] Where the Lindy effect applies, mortality rate decreases with time. In contrast, living creatures and mechanical things follow a bathtub curve where, after "childhood", the mortality rate increases with time. Because life expectancy is probabilistically derived, a thing may become extinct before its "expected" survival. In other words, one needs to gauge both the age and "health" of the thing to determine continued survival.
wiki  reference  concept  metabuch  ideas  street-fighting  planning  comparison  time  distribution  flux-stasis  history  measure  correlation  arrows  branches  pro-rata  manifolds  aging  stylized-facts  age-generation  robust  technology  thinking  cost-benefit  conceptual-vocab  methodology  threat-modeling  efficiency  neurons  tools  track-record 
3 days ago by nhaliday
Psychopathy by U.S. State by Ryan Murphy :: SSRN
Rentfrow et al. (2013) constructs a cross-section of the “Big Five” personality traits and demonstrates their relationship with outcomes variables for the continental United States and the District of Columbia. Hyatt et al. (Forthcoming) creates a means of describing psychopathy in terms of the Big Five personality traits. When these two findings are combined, a state-level estimate of psychopathy is produced. Among the typical predictions made regarding psychopathy, the variable with the closest univariate relationship with this new statistical aggregate is the percentage of the population in the state living in an urban area. There is not a clear univariate relationship with homicide rates.

Washington, D.C., harbors the greatest share of psychopaths in the US, "a fact that can be readily explained either by its very high population density or by the type of person who may be drawn a literal seat of power."
study  psychology  cog-psych  personality  disease  psychiatry  guilt-shame  the-devil  usa  the-south  virginia-DC  government  politics  institutions  leadership  power  trivia  cocktail  pro-rata  maps  within-group  geography  urban-rural  correlation  northeast  population  density  sociology  stylized-facts  data  database  objektbuch  psych-architecture 
june 2018 by nhaliday
Bragging Rights: Does Corporate Boasting Imply Value Creation? by Pratik Kothari, Don M. Chance, Stephen P. Ferris :: SSRN
We examine all S&P 500 firms over 1999-2014 that publicly characterize their annual performance with extreme positive language. We find that only 18% of such firms increase shareholder value, while nearly 75% have insignificant performance, and the remaining 7% actually destroy shareholder value. Our evidence suggests that firms often base their positive claims on high raw returns or strong relative accounting performance. In comparison to firms that generate positive abnormal returns without boasting, our sample firms tend to have superior accounting performance. These results show that boasting about performance is rarely associated with value creation and is consistent with executive narcissism.
study  economics  business  management  stylized-facts  trivia  leadership  finance  investing  objektbuch  correlation  language  emotion 
april 2018 by nhaliday
Altruism in a volatile world | Nature
The evolution of altruism—costly self-sacrifice in the service of others—has puzzled biologists1 since The Origin of Species. For half a century, attempts to understand altruism have developed around the concept that altruists may help relatives to have extra offspring in order to spread shared genes2. This theory—known as inclusive fitness—is founded on a simple inequality termed Hamilton’s rule2. However, explanations of altruism have typically not considered the stochasticity of natural environments, which will not necessarily favour genotypes that produce the greatest average reproductive success3,4. Moreover, empirical data across many taxa reveal associations between altruism and environmental stochasticity5,6,7,8, a pattern not predicted by standard interpretations of Hamilton’s rule. Here we derive Hamilton’s rule with explicit stochasticity, leading to new predictions about the evolution of altruism. We show that altruists can increase the long-term success of their genotype by reducing the temporal variability in the number of offspring produced by their relatives. Consequently, costly altruism can evolve even if it has a net negative effect on the average reproductive success of related recipients. The selective pressure on volatility-suppressing altruism is proportional to the coefficient of variation in population fitness, and is therefore diminished by its own success. Our results formalize the hitherto elusive link between bet-hedging and altruism4,9,10,11, and reveal missing fitness effects in the evolution of animal societies.
study  bio  evolution  altruism  kinship  stylized-facts  models  intricacy  random  signal-noise  time  order-disorder  org:nat  EGT  cooperate-defect  population-genetics  moments  expectancy  multiplicative  additive 
march 2018 by nhaliday
Overcoming Bias : The Model to Beat: Status Rank
People often presume that policy can mostly ignore income inequality if key individual outcomes like health or happiness depend mainly on individual income. Yes, there’s some room for promoting insurance against income risk, but not much room. However, people often presume that policy should pay a lot more attention to inequality if individual outcomes depend more directly on the income of others, such as via envy or discouragement.

However, there’s a simple and plausible income interdependence scenario where inequality matters little for policy: when outcomes depend on rank. If individual outcomes are a function of each person’s percentile income rank, and if social welfare just adds up those individual outcomes, then income policy becomes irrelevant, because this social welfare sum is guaranteed to always add up to the same constant. Income-related policy may influence outcomes via other channels, but not via this channel. This applies whether the relevant rank is global, comparing each person to the entire world, or local, comparing each person only to a local community.

That 2010 paper, by Christopher Boyce, Gordon Brown, and Simon Moore, makes a strong case that in fact the outcome of life satisfaction depends on the incomes of others only via income rank. (Two followup papers find the same result for outcomes of psychological distress and nine measures of health.) They looked at 87,000 Brits, and found that while income rank strongly predicted outcomes, neither individual (log) income nor an average (log) income of their reference group predicted outcomes, after controlling for rank (and also for age, gender, education, marital status, children, housing ownership, labor-force status, and disabilities). These seem to me remarkably strong and robust results. (Confirmed here.)
ratty  hanson  commentary  study  summary  economics  psychology  social-psych  values  envy  inequality  status  s-factor  absolute-relative  compensation  money  ranking  local-global  emotion  meaningness  planning  long-term  stylized-facts  britain  health  biases  farmers-and-foragers  redistribution  moments  metrics  replication  happy-sad 
march 2018 by nhaliday
What explains the formation and decay of clusters of creativity? - Marginal REVOLUTION
Creativity is often highly concentrated in time and space, and across different domains. What explains the formation and decay of clusters of creativity? In this paper we match data on thousands of notable individuals born in Europe between the XIth and the XIXth century with historical data on city institutions and population. After documenting several stylized facts, we show that the formation of creative clusters is not preceded by increases in city size. Instead, the emergence of city institutions protecting economic and political freedoms facilitates the attraction and production of creative talent.

IOW, the opposite of what Dick Florida said.
econotariat  marginal-rev  links  commentary  study  economics  growth-econ  broad-econ  cliometrics  innovation  stylized-facts  contrarianism  urban-rural  europe  the-great-west-whale  history  medieval  political-econ  institutions  microfoundations  roots  policy  nascent-state  creative  civil-liberty  randy-ayndy  polisci  regulation  capitalism  markets  mokyr-allen-mccloskey  enlightenment-renaissance-restoration-reformation  reflection  track-record 
january 2018 by nhaliday
Deliberate Practice and Performance in Music, Games, Sports, Education, and Professions: A Meta-Analysis
We found that deliberate practice explained 26% of the variance in performance for games, 21% for music, 18% for sports, 4% for education, and less than 1% for professions. We conclude that deliberate practice is important, but not as important as has been argued.
pdf  study  psychology  cog-psych  social-psych  teaching  tutoring  learning  studying  stylized-facts  metabuch  career  long-term  music  games  sports  education  labor  data  list  expert-experience  ability-competence  roots  variance-components  top-n  meta-analysis  practice  quixotic 
december 2017 by nhaliday
The rate of return on everything - Marginal REVOLUTION
Here is what I learned from the paper itself:

1. Risky assets such as equities and residential real estate average about 7% gains per year in real terms.  Housing outperformed equity before WWII, vice versa after WWII.  In any case it is a puzzle that housing returns are less volatile but about at the same level as equity returns over a broader time span.
2. Equity and housing gains have a relatively low covariance.  Buy both!
3. Equity returns across countries have become increasingly correlated, housing returns not.
4. The return on real safe assets is much more volatile than you might think.
5. The equity premium is volatile too.
6. The authors find support for Piketty’s r > g, except near periods of war.  Furthermore, the gap between r and g does not seem to be correlated with the growth rate of the economy.

I found this to be one of the best and most interesting papers of the year.
econotariat  marginal-rev  commentary  study  summary  economics  macro  investing  ORFE  securities  data  street-fighting  objektbuch  scale  time-preference  cost-benefit  outcome-risk  housing  money  monetary-fiscal  debt  history  mostly-modern  world-war  trends  correlation  moments  growth-econ  inequality  piketty  stylized-facts  war  meta:war 
december 2017 by nhaliday
Education and Political Participation: Exploring the Causal Link | SpringerLink
To test for a causal effect of education, we exploit the rise in education levels among males induced by the Vietnam draft. We find little reliable evidence that education induced by the draft significantly increases participation rates.
study  politics  polisci  education  human-capital  correlation  confounding  endogenous-exogenous  natural-experiment  null-result  military  war  history  mostly-modern  cold-war  asia  developing-world  sociology  phalanges  stylized-facts 
december 2017 by nhaliday
The Long-run Effects of Agricultural Productivity on Conflict, 1400-1900∗
This paper provides evidence of the long-run effects of a permanent increase in agricultural productivity on conflict. We construct a newly digitized and geo-referenced dataset of battles in Europe, the Near East and North Africa covering the period between 1400 and 1900 CE. For variation in permanent improvements in agricultural productivity, we exploit the introduction of potatoes from the Americas to the Old World after the Columbian Exchange. We find that the introduction of potatoes permanently reduced conflict for roughly two centuries. The results are driven by a reduction in civil conflicts
#4 An obvious counterfactual is of course the potato blight (1844 and beyond) in Europe. Here’s the Wikipedia page ‘revolutions of 1848’
pdf  study  marginal-rev  economics  broad-econ  cliometrics  history  medieval  early-modern  age-of-discovery  branches  innovation  discovery  agriculture  food  econ-productivity  efficiency  natural-experiment  europe  the-great-west-whale  MENA  war  revolution  peace-violence  trivia  cocktail  stylized-facts  usa  endogenous-exogenous  control  geography  cost-benefit  multi  econotariat  links  poast  wiki  reference  events  roots 
december 2017 by nhaliday
The political economy of fertility | SpringerLink
This paper studies the political economy of fertility. Specifically, I argue that fertility may be a strategic choice for ethnic groups engaged in redistributive conflict. I first present a simple conflict model where high fertility is optimal for each ethnic group if and only if the economy’s ethnic diversity is high, institutions are weak, or both. I then test the model in a cross-national dataset. Consistent with the theory, I find that economies where the product of ethnic diversity and a measure of institutional weakness is high have increased fertility rates. I conclude that fertility may depend on political factors.
study  sociology  speculation  stylized-facts  demographics  population  fertility  polisci  political-econ  institutions  nationalism-globalism  tribalism  us-them  self-interest  intervention  wonkish  pdf  piracy  microfoundations  phalanges  diversity  putnam-like  competition  israel  MENA  the-bones 
november 2017 by nhaliday
The Wilson Effect: the increase in heritability of IQ with age. - PubMed - NCBI
FIGURE 2 Estimates of genetic and shared environmental influence on g by age. The age scale is not linear (see text for details).
study  biodet  behavioral-gen  iq  psychology  cog-psych  metabuch  stylized-facts  variance-components  developmental  data  visualization  twin-study  correlation  🌞  pdf  piracy  age-generation  plots  psychometrics 
november 2017 by nhaliday
Frontier Culture: The Roots and Persistence of “Rugged Individualism” in the United States∗
In a classic 1893 essay, Frederick Jackson Turner argued that the American frontier promoted individualism. We revisit the Frontier Thesis and examine its relevance at the subnational level. Using Census data and GIS techniques, we track the frontier throughout the 1790–1890 period and construct a novel, county-level measure of historical frontier experience. We document the distinctive demographics of frontier locations during this period—disproportionately male, prime-age adult, foreign-born, and illiterate—as well as their higher levels of individualism, proxied by the share of infrequent names among children. Many decades after the closing of the frontier, counties with longer historical frontier experience exhibit more prevalent individualism and opposition to redistribution and regulation. We take several steps towards a causal interpretation, including an instrumental variables approach that exploits variation in the speed of westward expansion induced by prior national immigration in- flows. Using linked historical Census data, we identify mechanisms giving rise to a persistent frontier culture. Greater individualism on the frontier was not driven solely by selective migration, suggesting that frontier conditions may have shaped behavior and values. We provide evidence suggesting that rugged individualism may be rooted in its adaptive advantage on the frontier and the opportunities for upward mobility through effort.

The Origins of Cultural Divergence: Evidence from a Developing Country.:
Cultural norms diverge substantially across societies, often even within the same country. In this paper, we test the voluntary settlement hypothesis, proposing that individualistic people tend to self-select into migrating out of reach from collectivist states towards the periphery and that such patterns of historical migration are reflected even in the contemporary distribution of norms. For more than one thousand years during the first millennium CE, northern Vietnam was under an exogenously imposed Chinese rule. From the eleventh to the eighteenth centuries, ancient Vietnam gradually expanded its territory through various waves of southward conquest. We demonstrate that areas being annexed earlier into ancient Vietnam are nowadays more (less) prone to collectivist (individualist) culture. We argue that the southward out-migration of individualist people was the main mechanism behind this finding. The result is consistent across various measures obtained from an extensive household survey and robust to various control variables as well as to different empirical specifications, including an instrumental variable estimation. A lab-in-the-field experiment also confirms the finding.
pdf  study  economics  broad-econ  cliometrics  path-dependence  evidence-based  empirical  stylized-facts  values  culture  cultural-dynamics  anthropology  usa  frontier  allodium  the-west  correlation  individualism-collectivism  measurement  politics  ideology  expression-survival  redistribution  regulation  political-econ  government  migration  history  early-modern  pre-ww2  things  phalanges  🎩  selection  polisci  roots  multi  twitter  social  commentary  scitariat  backup  gnon  growth-econ  medieval  china  asia  developing-world  shift  natural-experiment  endo-exo  endogenous-exogenous  hari-seldon 
october 2017 by nhaliday
Love Thy Neighbor? Ethnoracial Diversity and Trust Reexamined: American Journal of Sociology: Vol 121, No 3
For whites, heterogeneity means more out-group neighbors; for nonwhites, heterogeneity means more in-group neighbors. Therefore, separate analyses were conducted by ethnoracial groups. Only for whites does living among out-group members—not in diverse communities per se—negatively predict trust.

doesn't really change the essential lesson
study  polisci  sociology  anthropology  trust  cohesion  diversity  putnam-like  🎩  microfoundations  tribalism  us-them  n-factor  anomie  social-capital  malaise  stylized-facts  the-bones  cooperate-defect  identity-politics  spearhead  wonkish  intricacy 
september 2017 by nhaliday
Duverger's law - Wikipedia
plurality-rule elections (such as first past the post) structured within single-member districts tend to favor a two-party system and that "the double ballot majority system and proportional representation tend to favor multipartism"
politics  polisci  sociology  institutions  stylized-facts  social-choice  wiki  reference  concept  government  correlation  coordination 
september 2017 by nhaliday
Who Emigrates From Denmark? – LaborEcon
Ilpo Kauppinen, Panu Poutvaara, and I have just finished a paper that examines the selection characterizing emigrants from Denmark, one of the richest and most redistributive European welfare states.

The paper makes a neat theoretical contribution. It derives the conditions that determine whether the skill distribution of the emigrants stochastically dominates (or is stochastically dominated by) the skill distribution of the stayers. Because the rewards to skills in Denmark are low (relative to practically all possible destinations), the model predicts that the emigrants will be positively selected, and that the skill distribution of the movers will stochastically dominate that of the stayers.

Our analysis of administrative data for the entire Danish population between 1995 and 2010 strongly confirms the implications of the model. Denmark is indeed seeing an outflow of its most skilled workers. And that is one of the consequences that a very generous welfare state must learn to live with.

The paper is forthcoming in the Economic Journal.
econotariat  borjas  economics  macro  labor  redistribution  welfare-state  europe  nordic  migration  human-capital  compensation  inequality  egalitarianism-hierarchy  anglosphere  correlation  selection  study  summary  🎩  stylized-facts  wonkish  policy  unintended-consequences  comparison  polisci  political-econ  nationalism-globalism  dysgenics 
september 2017 by nhaliday
Liberals Possess More National Consensus on Political Attitudes in the United StatesSocial Psychological and Personality Science - Peter Ondish, Chadly Stern, 2017
Using two nationally representative data sets (the General Social Survey and the American National Election Studies), we examined the attitudes of over 80,000 people on more than 400 political issues (e.g., attitudes toward welfare, gun control, same-sex marriage) across approximately 40 years. In both data sets, we found that liberals possessed a larger degree of agreement in their political attitudes than did conservatives. Additionally, both liberals and conservatives possessed more consensus than did political moderates.
study  politics  polisci  sociology  ideology  coalitions  homo-hetero  moments  comparison  left-wing  right-wing  tribalism  us-them  policy  data  analysis  general-survey  stylized-facts  class-warfare  polarization 
september 2017 by nhaliday

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