Plenty of business ideas seem like winners when first unveiled, as most of them are big hits with consumers. As time goes on, however — and we’re given the gift of hindsight — a harsh reality can start to set in: Many of those great ideas simply can’t be operated profitably, or don’t have long-term viability.
Here’s a look back at the market’s five biggest letdowns, each of which was hailed as a brilliant business venture in their early days — and one of which has only recently started to show its true colors:















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