Value-at-risk methods which employ a linear (“delta only”) approximation to the relation between instrument values and the underlying risk factors are unlikely to be robust when applied to portfolios containing non-linear contracts such as options. The most widely used alternative to the delta-only approach involves revaluing each contract for a large number of simulated values of the underlying factors. In this paper we explore an alternative approach which uses a quadratic approximation to the relation between asset values and the risk factors. This method (i) is likely to be better adapted than the linear method to the problem of assessing risk in portfolios containing non-linear assets, (ii) is less computationally intensive than simulation using full-revaluation and (iii) in common with the delta-only method, operates at the level of portfolio characteristics (deltas and gammas) rather than individual instruments.

The property that ideas are nonrivalrous leads to a tight link between idea-based growth models and increasing returns to scale. In particular, changes in the size of an economy’s population generally affect either the long-run growth rate or the long-run level of income in such models. This paper provides a partial review of the expanding literature on idea-based models and scale effects. It presents simple versions of various recent idea-based growth models and analyzes their implications for the relationship between scale and growth.

This paper presents an exact finite‐sample statistical procedure for testing hypotheses about the weights of mean‐variance efficient portfolios. The estimation and inference procedures on efficient portfolio weights are performed in the same way as for the coefficients in an OLS regression. OLS t ‐ and F ‐statistics can be used for tests on efficient weights, and when returns are multivariate normal, these statistics have exact t and F distributions in a finite sample. Using 20 years of data on 11 country stock indexes, we find that the sampling error in estimates of the weights of a global efficient portfolio is large.

This paper presents an exact finite‐sample statistical procedure for testing hypotheses about the weights of mean‐variance efficient portfolios. The estimation and inference procedures on efficient portfolio weights are performed in the same way as for the coefficients in an OLS regression. OLS t‐ and F‐statistics can be used for tests on efficient weights, and when returns are multivariate normal, these statistics have exact t and F distributions in a finite sample. Using 20 years of data on 11 country stock indexes, we find that the sampling error in estimates of the weights of a global efficient portfolio is large.

This study examines how political and economic factors affect the offer price, share allocation, and other terms governments choose when they privatize state-owned enterprises via a public share offering. Using a 59 country sample of 630 share issue privatizations (SIPs) with total proceeds of over $446 billion during the period 1977–1997, we find that governments consistently underprice SIP offers, tilt their share allocation patterns to favour domestic investors, impose control restrictions on privatized firms, and typically use fixed-price offers rather than book building or competitive tender offers, all to further political and economic policy objectives.

We compare institutional execution costs across the major U.S. exchanges using a sample of institutional equity orders in firms that switch exchanges. Execution costs including commissions are essentially indistinguishable across these exchanges. We also find the fraction of trading volume from momentum traders is greater on the NYSE than either the Nasdaq or AMEX and that orders are more likely to be worked by an institution's trading desk on the NYSE than on the Nasdaq. These results suggest that institutions actively manage execution strategies, taking into account characteristics of the markets in which they trade.

We consider risk-neutral firms that must obtain external finance. They have access to two kinds of stochastic investment opportunities. For one, return realizations are costlessly observed by all agents. For the other, return realizations are costlessly observed only by the investing firm. We examine the optimal allocation of investment between the two projects and the optimal contract used to finance it. The optimal contractual outcome can be supported by appropriate (and determinate) quantities of debt and equity issues. Investments in projects with CSV problems are associated loosely with debt. Investments in projects with observable returns are associated with equity. Journal of Economic Literature Classification Numbers: G21, E51.

This paper examines the immediate and long-term impacts on financial performance of 124 management successions within Canadian family controlled firms. When family successors are appointed, stock prices decline by 3.20% during the 3-day (−1 to +1) event window, whereas there is no significant decrease when either non-family insiders or outsiders are appointed. However, a cross-sectional analysis indicates that the negative stock market reaction to family successors is related to their relatively young age which may reflect a lack of management experience rather than their family connection per se. Investors are uncertain about the “management quality” of family successors who have less established reputations than more seasoned non-family insiders and outsiders. Non-family member appointments tend to follow periods of poor operating performance implying that there might be more scope for improvement when a non-family successor is appointed. Unlike the US sample in McConaughy et al. [McConaughy, D.L., Walker, M.C., Henderson, G.V., Mishra, C.S., 1998. Founding family controlled firms: efficiency and value, Review of Financial Economics 7, 1–19.], which indicates that the median percentage of votes held by controlling families is less than 15%, the Canadian sample indicates a more concentrated ownership with the median percentage of family controlled votes exceeding 51%. Of the firms in our sample, 62% use dual class capitalization to maintain control within the family.