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The pirate and the merchant could meet in a large, open field, stand about 10 paces apart, and face each other, the pirate facing southeast and the merchant facing northwest. Their vessels would need to be moored or parked in the direction to their rear. Here is an example graphic: On cue, the pirate would walk due South 10 paces while the merchant would ...


2

There are three necessary assumptions here: (1) It is possible to build a physical mechanism that neither one of them can break. If this were not the case, the only way trades could be made is by one person directly giving an item to the other. However, just giving items back and forth doesn't work: as soon as there's an imbalance in the wealth gained, ...


1

Find a narrow ravine and have one person stand on either side with the goods to be traded. Suspend a log over the ravine from a single rope in the center, so that it can spin freely and one end can be reached by either party. To start, each end of the log is firmly fixed to the ground on either side, so neither party can spin the log until both release it. ...


1

They could: Before each deal:


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