A proliferation of shopping apps now let consumers compare prices across products and retailers, order goods and pay at physical checkouts. But the Federal Trade Commission has released a study arguing that mobile shopping apps often don't tell users enough about how they handle transactions that go wrong or, worse, were never intended. And though most made big security promises and linked out to privacy policies, too many stayed too vague about how they use consumer data in practice, according to the FTC. This Mini Law Lesson covers what app developers and startups need to know to keep the government happy.

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