Note: this post contains no original ideas, nor even any attempts at originality. Instead, it's simply my way of making sense of a complicated issue.
While we've seen the concept of מחוסר אמנה in the פוסקים for two weeks already, yesterday was the first time we started looking into the גמרא. In brief, מחוסר אמנה is when two people reach a verbal agreement, and all the terms are agreed upon, but no money has been transfered (and obviously no קניין has been made). If one of them backs out at that point, he has done a Bad Thing™.
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