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Trade with the Venetians contributed to the fall of the Byzantine through the presence of trade rivalry.

The Venetians and the Byzantine's had a trade pact initially that gave the Venetians trade concessions if they helped the Byzantine's fight their enemies.

Venice never fulfilled its promise to help the Byzantine's fight their enemies even after benefitting from trade. Instead they reaped trade benefits from the pact signed while the Byzantine's went on a decline.

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