Rahim, Wali, and the Wise King

When King Abdullah must leave his castle to protect the kingdom from bandits, he faces a tough decision; which of his two sons is wise enough to rule in his absence? With only five dinars, each prince must fill an empty room so that not a single corner is left bare. One rushes to the marketplace in search of furniture, but the other takes a very different approach. Which son will be able to complete the king's task?