Man-earn money = Donkey
In other words,
Woman who doesn’t spend = Donkey
From Equation 2 and Equation 3
Man who doesn’t earn money = Woman who doesn’t spend
So Man earns money not to let woman become a donkey!
And a woman spends not to let the man become a donkey!
So, We have:
Man + Woman = Donkey + earn money + Donkey + Spend money
Therefore from postulates 1 and 2, we can conclude
Man + Woman = 2 Donkeys that live happily together!