The problem lies in the trade-off between time and income, since to raise a poor household’s income above MO, its time has to be reduced to less than TO. Conversely, if a household slightly above the monetary poverty line tries to increase its free time to a value equal to or greater than TO, its income will fall below MO. Therefore, a poverty threshold that incorporates time and money must have a minimum monetary level (MO), a minimum time value (TO) and a trade-off between the two.