In north american cultures a potlatch can be best described as

Giving gifts

Explanation:

A potlatch is a gift-giving feast exercised by the autochthonous people of the Pacific Northwest Coast of Canada and the United States. It is their chief economic system. This is a form of competing for exchange in which bartenders show their property and influence by providing away goods; they become a social weaponry.

b) the planets year length would be longer

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answer; product market;