We develop a positive behavioral portfolio theory (BPT) and explore its implications for portfolio constrution and security design. The optimal portfolios of BPT investors resemble combinations of bonds and lotterly tickets consistent with Friedman and Savage's (1948) observation. We compare the BPT efficient frontier with the mean-variance efficient frontier and show that, in general, the two frontiers do not coincide. Optimal BPT portfolios are also different from optimal CAPM portfolios. In particular, the CAPM two-fund separation does not hold in BPT. We present BPT in a single mental account version (BPT-SA) and a multiple mental account version (BPT-SA). BPT-SA investors integrate their portfolios into a single mental account, while BPT-SA investors segregate their portfolios into several mental accounts. BPT-SA portfolios resemble layered pyramids, where layers are associated with aspirations. We explore a two-layer portfolio where the low aspiration layer is designed to avoid poverth while the high aspiration layer is designed for a shot at riches.

This paper examines the profitability of momentum strategies implemented on international stock market indices. Our results indicate statiscally significant evidence of momentum profits. The momentum profits arise mainly from time-series predictability in stock market indices—very little profit comes from predictability in the currency markets. We also find higher profits for momentum portfolios implemented on markets with higher volume in the previous period, indicating that return continuation is stronger following an increase in trading volume. This result confirms the informational role of volume and its applicability in technical analysis.

We analyze the dividend behaviour of the aggregate stock market. We propose a model that assumes managers minimize the costs of adjustment associated with being away from their target dividend payout. The target is expressed as a function of lagged stock prices and permanent earnings, generalizing previous models of dividend behaviour. We present a new method for measuring unobserved permanent earning based on the Kalman filter. Our specification of dividend behaviour is strongly supported by the data relative to both alternative models and over time. We find significant evidence of dividends conveying information regarding unexpected positive changes in current permanent earnigs. We also find that both the speed of adjustment of dividends to target dividends and tests of signaling are sensitive to the specification of the model.

I introduce two-factor discrete time stochastic volatility models of the short-term interest rate to compare the relative performance of existing and alternative empiricial specificattions. I develop a nonlinear asymmmetric framework that allows for comparisons of non-nested models featuring conditional heteoskedasticity and sensitivity of the volatility process to interest rate levels. A new class of stochastic volatility models with asymmetric GARCH models. The existing models are rejected in favor of the newly proposed models because of the asymmetric drift of the short rate, and the presence of nonlinearity, asymmetry, GARCH, and level effects in its volatility. I test the predictive power of nested and non-nested models in capturing the stochastic behavior of the risk-free rate. Empirical evidence on three-, six-, and 12-month U.S. Treasury bills indicates but that two-factor stochastic volatility models are better than diffusion and GARCH models in forecasting the future level and volatility of interest rate changes.

We examine the impact of merger announcements on protfolios of acquiring firm and target firm common stock from 1919 to 1930. despite vast changes in the economic and regulatory environment, overall acquisition profitability has remained remarkably constant over the last 70 and 80 years. Target firm shareholders in the 1920s clearly gained from takeovers, averaging abnormal retruns in excess of 15%, while acquiring firm shareholders essentially broke even. synergistic or monopolistic gains from consolidation were minimal. Unlike the more recent experience, target firm and acquiring firm abnormal returns were largely unaffected by the mode of acquisition, the means of financing, or the degree of industrial relatedness.

This study examines the stock market forecasts and portfolio allocation decisions of small individual investors, based on survey data for 1987–1994. When investors are bullish, they increase their equity holdings; when investors are bearish, they decrease equity holdings. The surveyed investors are unable to time the stock market successfully. However, the shifts in their portfolios reflect past market movements and are consistent with positive feedback trading.