Multi-asset consumption-investment problems with infinite transaction costs

TL;DR

This paper analyzes an optimal consumption and investment problem with multiple risky assets where transaction costs are infinite for one asset, leading to a simplified boundary crossing problem for an agent's optimal selling strategies.

Contribution

It introduces a model with infinite transaction costs on one asset, enabling an explicit characterization of optimal behaviors via a boundary crossing problem for a first order ODE.

Findings

Complete characterization of optimal selling strategies for the endowed asset.

Reduction of the complex HJB PDE to a simpler first order ODE.

Proof of monotonicity of the critical threshold and certainty equivalent value.

Abstract

The subject of this paper is an optimal consumption/optimal portfolio problem with transaction costs and with multiple risky assets. In our model the transaction costs take a special form in that transaction costs on purchases of one of the risky assets (the endowed asset) are infinite, and transaction costs involving the other risky assets are zero. Effectively, the endowed asset can only be sold. In general, multi-asset optional consumption/optimal portfolio problems are very challenging, but the extra structure we introduce allows us to make significant progress towards an analytical solution. For an agent with CRRA utility we completely characterise the different types of optimal behaviours. These include always selling the entire holdings of the endowed asset immediately, selling the endowed asset whenever the ratio of the value of the holdings of the endowed asset to other wealth gets above a critical ratio, and selling the endowed asset only when other wealth is zero. This characterisation is in terms of solutions of a boundary crossing problem for a first order ODE. The technical contribution is to show that the problem of solving the HJB equation, which is a second order, non-linear PDE subject to smooth fit at an unknown free boundary, can be reduced to this much simpler problem involving an explicit first order ODE. This technical contribution is at the heart of our analytical and numerical results, and allows us to prove monotonicity of the critical exercise threshold and the certainty equivalent value in the model parameters.