Genesis 47:13-17 Livestock Exchange

"There was no food, however, in the whole region because the famine was severe; both Egypt and Canaan wasted away because of the famine.  Joseph collected all the money that was to be found in Egypt and Canaan in payment for the grain they were buying, and he bought it to Pharaoh's palace.  When the money of the people of Egypt and Canaan was gone, all Egypt came to Joseph and said, 'Give us food.  Why should we die before your eyes?  Our money is used up.'

'Then bring your livestock,' said Joseph.  'I will sell you food in exchange for your livestock, since your money is gone.'  So they brought their livestock to Joseph, and he gave them food in exchange for their horses, their sheep and goats, their cattle and donkeys.  And he brought them through that year with food in exchange for all their livestock."  (Genesis 47:13-17 NIV)
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Joseph continues to implement his plant to sell the food reserves which they had collected to the Egyptians and people from other nations during the seven years of famine.  However, soon the Egyptians' money was gone.  Joseph had little choice at that point, for if he did not accept livestock as payment for food, the Pharaoh's subjects would eventually perish.