If 1 can buy a car today for $\$ 5,000$ and it is worth $\$ 10,000$ in extra income next year to me because it enables me to get a job as a traveling salesman, should I take out a loan from Larry the Loan Shark at a $90 \%$ interest rate if no one else will give me a loan? Will I be better or worse off as a result of taking out this loan? Can you make a case for legalizing loan sharking?