This paper proposes a two-stage sealed-bid model for the execution of blind portfolios. An asset manager auctions a package of securities to a set of brokers who are unaware of the specific details about individual securities. We prove that our mechanism reduces the costs of execution for the...

We introduce and analyze a new market design for trading financial assets. The design allows traders to directly trade any user-defined linear combination of assets. Orders for such portfolios are expressed as downward-sloping piecewise-linear demand curves with quantities as flows...

We study the determinants of asset market fragmentation. We develop a model of market formation with strategic investors that have heterogeneous valuations for an asset. Investors choose a dealer with whom to trade considering their price impact and the liquidity provided by the dealer....