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The hostage model.
Party A
Party B
Use non-specialized technology
Hold up
Don’t hold up
(½π, ½π)
(-h, αh-C)
wh is the value of the hostage to B; α is the fraction of h that has value to A.
Party A
Don’t give in
Give in
(0.9π, 0.1π)
wA money bond would have α = 1.  But is an in-kind hostage a more credible commitment?
Use specialized technology
(¼π, ¼π)