The article explores how economies with complete markets and collateral constraints reach equilibrium. It shows that with the right assets and collateral, these equilibria are similar to those in standard markets with limited borrowing rules. When collateral is scarce, tighter borrowing limits can benefit everyone. The study also finds that equilibria are often not as efficient as they could be. By setting specific conditions, the researchers show that equilibria can be efficient and have finite support in certain scenarios. Overall, the model used in the study allows for accurate computation of equilibrium outcomes and sheds light on risk-sharing and efficiency in these dynamic economies.