Belief Formation

  • 详情 Do Employees at Work Keep an Eye on the Stock Market? Evidence from a Manufacturer in China
    Combining daily personnel records of an unlisted manufacturer with stock market data, we find that market overnight returns negatively predicts same-day worker output. The effect is greater on Mondays and extreme overnights. Analysis suggests that the stock market attracts (discourages) public attention when the overnight returns are extremely positive (negative), consistent with humans’ natural tendency of incorporating good news while discounting bad news. As a result, employees at work are disproportionally distracted by positive overnight returns, leading to reduced output. Additional evidence suggests that our results can hardly be explained with alternative distraction events or workers’ stock wealth concerns. This study reveals a novel channel through which the financial market shapes labor supply.
  • 详情 Memory and Beliefs in Financial Markets: A Machine Learning Approach
    We develop a machine learning (ML) approach to establish new insights into how memory affects ffnancial market participants’ belief formation processes in the field. Using analyst forecasts as proxies for market beliefs, we extract analysts’ mental contexts and recalls that shape forecasts by training an ML memory model. First, we find that long-term memories are salient in analysts’ recalls. However, compared to an ML benchmark trained to fit realized earnings, analysts pay more attention to distant episodes in regular times but less during crisis times, leading to recall distortions and therefore forecast errors. Second, we decompose analysts’ mental contexts and show that they are mainly shaped by past earnings and forecasting decisions instead of current firm fundamentals as indicated by the ML benchmark. This difference in contexts further explains the recall distortion. Third, our comprehensive memory model reveals the significance of specific memory features and channels in analysts’ belief formation, including the temporal contiguity effect and selective forgetting.
  • 详情 Investor Memory and Biased Beliefs: Evidence from the Field
    We survey a large representative sample of retail investors to elicit their memories of stock market investment and return expectations. We then merge the survey data with administrative data of transactions to test a model in which investors form expectations by selectively recalling past experiences similar to the present cue. Our analysis not only uncovers newstylized facts about investor memory, but also provides support for similarity-based recall as a key mechanism of belief formation in ffnancial markets. Market ffuctuations affect investors’ recall: positive market returns cue investors to retrieve episodes of rising markets and recall own performances more positively. Recalled experiences explain a sizable fraction of cross-investor variation in beliefs and dominate actual experiences in explanatory power. We also show that recalled experiences can drive out the explanatory power of recent returns for expected future returns, ruling in a memory-based foundation for return extrapolation.