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In this paper, we describe and compare two approaches to analyzing transactions costs in a general equilibrium setting. In the first approach, which we label the transactions costs approach, the commodity space is the same as that used in models without transactions costs. In the second approach, which we label the valuation equilibrium approach, the commodity space is chosen so that the exchange problem can be formulated as an instance of the abstract exchange model described in Debreu (1954)doi:10.2139/ssrn.202712 fatcat:jlsnux4ufveyljps35pmm2m7ai