This paper considers share repurchases as the way long-term shareholders preserve their ability to use corporate information for speculative purposes when insider trading regulation is enforced. This use of corporate information increases the adverse selection losses of short-term shareholders. Thus, buy-back programs reduce their incentive to invest in stocks that back the most productive technology, leading to a socially inefficient equilibrium. It follows that insider trading should not be banned when share repurchases are allowed. More generally, the paper argues that the regulation of insider trading and repurchases can not be considered in isolation, and analyzes their interplay.

This paper determines the optimal ownership share held by a unit into a second unit when both face a tax-bankruptcy trade-off. Full ownership is optimal when the first unit has positive debt, because dividends help avoid its default. Positive debt is, in turn, optimal when its corporate tax rate exceeds a threshold, and/or thin capitalization rules place an upper limit on the debt level in the second unit, and/or the Volcker Rule bans bailout transfers to the second unit. Full ownership is no longer optimal only if there is a tax on intercorporate dividend. This theory rationalizes observations on multinationals, financial conglomerates, and family groups.

This paper considers the optimal joint decision on firm organization and capital structure under a tax-bankruptcy trade-off, stressing the role of guarantees against default. Conditional guarantees, which are embedded in parent-subsidiary structures, increase joint value and joint debt relative to unguaranteed stand-alone firms. Such guarantees, that are unilateral rather than mutual for moderate default costs, may dominate the unconditional mutual guarantees built in mergers. We study the optimal characteristics of both guarantors and beneficiaries, as well as their impact on the self-enforcement potential of conditional guarantees.

This paper shows that share issue privatization (SIP) is a major source of domestic stock market liquidity in 19 developed economies. Particularly, privatization IPOs have a negative effect on the price impact – measured by the ratio of the absolute return on the market index to turnover. This result is robust to the inclusion of controls for other observable and unobservable factors, having also considered the endogenous nature of the decision to privatize. We also provide evidence of a positive spillover of SIP on the liquidity of private companies. This cross-asset externality is one implication of liquidity theories emphasizing the improved risk diversification opportunities and risk sharing brought about by privatization. This externality stems from both domestic privatization IPOs and cross-listings.

We compare equilibrium trading outcomes with and without participation by an informed insider, assuming inflexible ex ante aggregate investment choices by agents. Noise trading arises from aggregate uncertainty regarding other agents' intertemporal consumption preferences. The welfare levels of outsiders can thus be ascertained. The allocations without insider trading are not ex ante Pareto efficient, because our model differs from standard ones with negative exponential utility functions and normal returns. We characterize the circumstances under which the revelation of payoff‐relevant information via prices—arising from insider trading—benefits outsiders with stochastic liquidity needs, by improving risk‐sharing among them.

Household portfolios include risky bonds, beyond stocks, and respond to permanent labor income shocks. This article brings these features into a life-cycle setting, and shows that optimal stock investment is constant or increasing in age before retirement for realistic parameter combinations. The driver of such inversion in the life-cycle profile is the resolution of uncertainty regarding social security pension, which increases the investor’s risk appetite. This occurs if a small positive contemporaneous correlation between permanent labor income shocks and stock returns is matched by a realistically high degree of risk aversion. Absent this combination, the typical downward-sloping profile obtains. Overlooking differences in optimal investment profiles across heterogeneous workers results in large welfare losses, in the order of 15–30% of lifetime consumption.