The cost of owning a home will typically exceed the cost of renting when the price-to-rent ratio > 20
(the cost of buying a home divided by the annual rent of similar property)
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Отсюда: http://www.businessinsider.com/buy-or-rent-city-mortgage-sale-house-2015-1
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Бонус - бизнес анализ: покупать или рентовать секс?: http://hojja-nusreddin.livejournal.com/1743536.html