Working Paper: NBER ID: w29881
Authors: Jonathan A. Parker; Antoinette Schoar; Allison T. Cole; Duncan Simester
Abstract: This paper shows a dramatic change in the investment behavior of the U.S. middleclass. During the 2010s, the average share of investable wealth that people hold in stocks is roughly ten percent larger than in the 1990s, and now has a strong lifecycle pattern, rising modestly early in life and falling significantly as retirement approaches. These changes in portfolio allocation were facilitated by the Pension Protection Act (PPA) of 2006, which allowed employers to adopt target date funds (TDFs) as default options in retirement saving plans. Young workers enrolling at an employer shortly after its plan adopts TDFs as defaults have higher equity shares than those who enroll at that same employer shortly before. In contrast to what we find for portfolios, retirement contribution rates over the life-cycle have been relatively stable across cohorts over time, and we find no evidence that the PPA directly raised contribution rates on average.
Keywords: retirement saving; household portfolios; target date funds; Pension Protection Act
JEL Codes: D14; E21; G11; G23; G28; G51
Edges that are evidenced by causal inference methods are in orange, and the rest are in light blue.
| Cause | Effect |
|---|---|
| Increase in equity shares (G12) | Lifecycle pattern of wealth allocation (G51) |
| Regulatory changes (G18) | Stability in retirement saving rates across cohorts (D15) |
| Adoption of TDFs as defaults (G19) | Increased equity shares among younger investors (G51) |
| Younger investors enrolling post-TDF adoption (G23) | Higher percentage of wealth in stocks (G51) |
| TDF adoption (Y10) | Decrease in stock investments among older workers (J26) |