I presume that United have a turnover large enough to manage their debts every season, and their spending has been cut down recently. The sale of Ronaldo has probably kept them safe for a while, but at what detriments to their first team?!!
It's difficult to know what's going on from we're sitting, but if it's true that Liverpool are in colossal amounts of debt, like United, then will they have to sell assets too? I.e. Torres, Gerrard... Lucas.
It'd be interesting to see what would happen if they failed to qualify for the Champions League.