We explore how traders’ equity capitalization influences asset prices in a framework that accounts for market power. In our model, traders with capital constraints engage in transactions in an imperfectly competitive market. We demonstrate that looser capital constraints elevate both asset prices and price impact, the latter diminishing market liquidity. Using Canadian Treasury auction data, we illustrate how to apply our model to quantify these effects. We estimate the shadow costs of capital constraints by leveraging a temporary policy exemption during 2020–2021. We show that while these constraints are only infrequently binding, their relative impact when activated can be sizable.

We examine the relationship between concentration and price dispersion using variation induced by a merger in the Canadian mortgage market. Since interest rates are determined through a search and negotiation process, consolidation weakens consumers' bargaining positions. We use reduced-form techniques to estimate the mergers' distributional impact, and show that competition benefits only consumers at the bottom and middle of the transaction price distribution, and that mergers reduce the dispersion of prices. We illustrate that these effects can be explained by the presence of search frictions, and that the average effect of mergers on rates underestimates the increase in market power.