Strategy

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.

We develop a simulation model of the game of golf. The model accounts for realistic features of a golf course, including rough, sand, water, and trees, and includes many facets of golfer skill. The model is calibrated to extensive data for amateur and professional golfers. Using the calibrated simulation model we quantify the effect of increased tee shot distance and improved tee shot accuracy on golfer scores. Contrary to previous claims, we find that for long tee shots, directional accuracy has a greater impact on scores than distance.

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.

The silver lining effect predicts that segregating a small gain from a larger loss results in greater psychological value than does integrating them into a smaller loss. Using a generic prospect theory value function, we formalize this effect and derive conditions under which it should occur. We show analytically that if the gain is smaller than a certain threshold, segregation is optimal. This threshold increases with the size of the loss and decreases with the degree of loss aversion of the decision maker.

We analyze a planning model for a firm or public organization that needs to cover uncertain demand for a given item by procuring supplies from multiple sources. The necessity to employ multiple suppliers arises from the fact that when an order is placed with any of the suppliers, only a random fraction of the order size is usable. The model considers a single demand season with a given demand distribution, where all supplies need to be ordered simultaneously before the start of the season.

No matter your field, industry, or specialty, as a leader you make a series of crucial decisions every single day. And the harsh truth is that the majority of decisions — no matter how good the intentions behind them — are mismanaged, resulting in a huge toll on organizations, the people they employ, and even the people they serve.

We report the results of a large-scale field experiment performed in the context of the national launch of a new cosmetic product. The manufacturer launched this new product using three promotional tools in parallel: full-page advertisements in fashion magazines, free standing inserts (FSI) in Sunday newspapers, and a viral marketing campaign. Each promotional tool featured an identical discount coupon for the new product, but with different redemption codes across promotional tools.

This paper examines the relation between ownership, corporate form, and innovation for a cross-section of private and publicly traded innovating firms in the US and 15 European countries. A striking novel observation emerges from our analysis: while most innovating firms in the US are publicly traded conglomerates, a substantial fraction of innovation is concentrated in private firms and in business groups in continental European countries.

Donald E. Sexton, PhD, a professor of marketing at Columbia University and president of The Arrow Group, Ltd., discusses one key way to link marketing activity to financial performance.