Economics Insights @ CBS

We characterize the equilibrium behavior in a broad class of competition models in which the competing firms' market shares are given by an attraction model, and the aggregate sales in the industry depend on the aggregate attraction value according to a general function. Each firm's revenues and costs are proportional with its expected sales volume, with a cost rate that depends on the firm's chosen attraction value according to an arbitrary increasing function.

Consumers learn quality of many durable products through word-of-mouth information while firms launch new and improved products frequently in these markets. This paper examines firm incentives to invest in R&D to compete for patents in markets where consumers rely on word-of-mouth information and have expectations about the new products before launch. When its loss due to a possible entry is above a threshold, an incumbent has more incentives than a potential entrant to invest in R&D for patents.

We examine international stock return comovements using country-industry and country-style portfolios as the base portfolios. We first establish that parsimonious risk-based factor models capture the data covariance structure better than the popular Heston-Rouwenhorst (1994) model. We then establish the following stylized facts regarding stock return comovements. First, there is no evidence for an upward trend in return correlations, except for the European stock markets. Second, the increasing importance of industry factors relative to country factors was a short-lived phenomenon.

Under accrual accounting, earnings add to shareholders' equity. Cash flow generated by a business has no effect on the book value of shareholders' equity but reduces the book value of net assets employed in business operations. In short, accrual accounting rules prescribe that earnings add to shareholder value, but cash flow is irrelevant to the valuation of equity. This paper documents that the stock market prices equity shares according to this prescription.