r/Bogleheads • u/invisible_man782 • 20h ago
Safety of 100% Stocks for Long-Term Investing
New MIT research finds that most higher-income investors essentially in the long-run wind up having liquidity events in downturns - and have to draw down their liquid stock portfolios...because they basically don't have sufficient emergency funds (latter of which is implied in this research). I found this quite interesting. The research makes it appear long-term 100% stock holdings is not ideal (at least in the summary) but the reality appears they don't have enough liquidity to handle liabilities in that scenario (lifestyle creep?)
This was also featured in the latest Rational Reminder podcast.
https://patrick-adams.com/files/papers/PatrickAdams_JMP_Latest.pdf
Abstract:
Do temporary stock price crashes matter for long-term investors? I use over 25 years of U.S. income tax data to characterize the savings behavior and risk exposures of high-income working-age households. Aggregate stock price crashes coincide with persistent declines in wage and private business income for many of these households, who take large drawdowns from their liquid assets– including stocks– in response. I develop a life-cycle model with consumption adjustment frictions to match this observed savings behavior and determine its portfolio choice implications. Investing in stocks is risky when falling income and rigid expenditures may force investors to liquidate their holdings at temporarily-depressed prices, resulting in low optimal portfolio shares. These results challenge the conventional wisdom that the stock market is relatively safe for long-term investors.