Cash is portable, hard to trace, and universally-accepted, no questions asked. Which makes it a good thing to steal. There may be a relationship between the decline in the crime rate and the rise of debit-cards and other electronic means of exchange. A study suggests this is the case in poor neighborhoods, ever since the welfare system replaced cashable checks with debit cards.
From Christopher Ingraham, To fight crime in your community, stop using cash:
A new study has found that paying welfare benefits via debit card, rather than cash, caused a 10 percent drop in crime.
Researchers have long noted that cash plays a critical role in street crime, due to its liquidity (it’s easy to access and everyone accepts it) and anonymity (it leaves no paper trail). In poorer neighborhoods, public assistance payments used to be a significant source of circulating cash: recipients would cash their assistance checks at the bank, pocketing the money and making them attractive targets for criminals.