ABSTRACT:Transaction cost economics is used to produce a conceptual framework that helps explain public-sector contract decisions. When a product is easy to specify, easy to produce, and there is a thick market of buyers and sellers, fixed-price contracts are more likely; when a product is difficult to produce, difficult to specify, and the market has few buyers and sellers, costreimbursement contracts are more likely. These arguments were tested with five years of data (FY 2004(FY -2008