| http://www.w3.org/ns/prov#value | - Parties enter into executory contracts instead of present exchanges for twoprincipal reasons: (1) to protect and thereby encourage relationship specific (orreliance) investments which increase the value of their exchange and (2) totransfer risks and thereby to exploit comparative advantages in risk-bearing.Accordingly, a distinction may be drawn between two types of contracts thatdefine opposite e
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