The key flaw in the tax farming system is the tension between the state, which seeks a long-term source of taxation revenue, and the tax farmers, who seek to make a profit on their investment in as short a time as possible. As a result, tax-farmers often abuse the taxpayers in various ways, tending them to switch their economic activity from strategic long-term projects to short-term revenue generation. A common abuse by tax farmers is the undervaluation of goods received in lieu of taxes, allowing the tax-farmer to re-sell the goods to create a second profit source. Such abuses stifle economic growth by restricting the ability of the tradesman to reinvest in his business, thereby limiting the quantity of taxes generated over the long-term.