We consider an investor who faces parameter uncertainty in a continuous-time financial market. We model the investor's preference by a power utility function leading to constant relative risk aversion. We show that the loss in expected utility is large when using a simple plug-in strategy for...

I investigate a dynamic life-cycle strategic asset allocation and consumption problem under model uncertainty, where both inflation rate and income growth rate are assumed to be estimated with errors. I present a feasible boundary for the uncertainty aversion parameter, which measures the...

The crisis of 2008 and 2009 exposed not only the shortcomings of our financial system but also the shortcomings of the tools used by financial advisors to assess and guide investors. These include risk questionnaires. Many investors who were assessed as risk tolerant in 2007 and assigned...

The literature on risk tolerance overwhelmingly justifies the use of questionnaires based on validity and reliability or psychometric testing, but there has been little research examining the relation between questions and actual investor portfolio behavior. This study examines risk tolerance...

Czarnitzki and Stadtmann (2005) measure the interdependence of demand for investment advice (approximated by sales of investor magazines) and stock prices. They find strong evidence that confirms the presence of the disposition effect, i.e. the empirical observation that investors sell winners...

This paper derives a robust online equity trading algorithm that achieves the greatest possible percentage of the final wealth of the best pairs rebalancing rule in hindsight. A pairs rebalancing rule chooses some pair of stocks in the market and then perpetually executes rebalancing trades so...

I investigate a dynamic life-cycle strategic asset allocation and consumption problem under model uncertainty, where both inflation rate and income growth rate are assumed to be estimated with errors. I present a feasible boundary for the uncertainty aversion parameter, which measures the...

Story-telling helps to define the human experience. Do people also use narratives to make sense of, and to act on, financial information? Three studies demonstrate that people's investment predictions and choices instead are by narrative thinking. Whereas neoclassical financial theory maintains...

The continuous-time CAPM assumes that investors are risk-averse. However, these is a very large body of empirical and experimental evidence documenting that many investors are not globally risk-averse: Prospect Theory and aspiration-level models are two well-known examples of this literature....

This paper analyzes investors' portfolio selection problems in a two-period dynamic model of Knightian uncertainty. We account for the existence of portfolio inertia in this two-period framework. Furthermore, by incorporating investors' updating behavior, we analyze how new observation in the...