Pré-publication, Document de travail: Bundling assets of heterogeneous quality results in dispersed valuations when these are based on investor-specific samples from the pool. A monop olistic bank has the incentive to create heterogeneous bundles only when investors have enough money as in that case prices are driven by more opti- mistic valuations. When the number of banks is sufficiently large, oligopolistic banks choose extremely heterogeneous bundles even when investors have little money and even if this turns out to be collectively detrimental to the banks, which we refer to as a Bundler.s Dilemma.