Ambiguity and learning about the equity premium can simultaneously explain the low fraction of financial wealth allocated to stocks over the life cycle and the stock market participation puzzle. Individuals are ambiguous about the size of the equity premium and are averse to this ambiguity, resulting in lower stock allocations over the life cycle, consistent with the data. As agents get older, they learn about the equity premium and increase their allocation to stocks. Furthermore, I find that ambiguity leads to underdiversification, home bias, lower Sharpe ratios, and higher savings. Similar results cannot be obtained by assuming higher risk aversion.

Using a measure of political risk, relative to the United States, that captures unexpected political conditions, we show that political risk is priced in the cross section of currency momentum and contains information beyond other risk factors. Our results are robust after controlling for transaction costs, reversals, and alternative limits to arbitrage. The global political environment affects the profitability of the momentum strategy in the foreign exchange market; investors following such strategies are compensated for the exposure to the global political risk of those currencies they hold, that is, the past winners, and exploit the lower returns of loser portfolios. The risk compensation is mainly justified by the different exposures of foreign currencies in the momentum portfolio to U.S. political shocks, which is the main component of global political risk.

This article explores the case of Deutsche Werkstätten Hellerau (DWH)—a furniture and interior manufacturer founded in 1898—through state socialism after 1945 and reprivatization in the 1990s. Our analysis suggests that the firm's survival through multiple systemic disruptions was partly due to the preservation of a unique identity despite heavy institutional pressures for conformity. DWH adopted a “mixed conformity” strategy that attempted to pitch multiple concerns (cultural-aesthetic, ideological, economic) of political authorities against one another to buffer sociopolitical pressures, thus ultimately conforming to some (identity-consistent) demands, while violating other (identity-threatening) ones. This allowed DWH to successfully navigate tensions between sociopolitical expectations and the need to preserve a collective sense of distinctiveness and continuity over time.

This article studies the genesis and early international expansion of the bank-issued credit card—an American innovation that quickly took hold in western Europe. Empirical evidence undermines the proposition of a single firm building a proprietary network. In fact, it was a constellation of participants that combined three characteristics, namely, a critical mass of both retail customers and retail merchants; the capacity to implement new technological solutions; and the ability to forge resilient collaborations across national borders. The evidence supports the value of collaboration in retail financial services as means of appropriating network externalities. Moreover, other conceptual and empirical studies, especially those based on two-sided markets, neglect the greater implications that initial conditions in this industry have on long-term success.