Whether you are buying an existing business or starting a new business, take the time to test market your proposed product or service. Your customer is the one who ultimately decides whether your business succeeds or fails, so be sure that potential customers are willing to part with their hard-earned cash to vote in favor of your product or service. One of the advantages of buying an existing business is knowing that a market already exists, but it would be wise to investigate further so that you fully understand that market.