I recently had a 'discussion' with a friend of mine about how he always wants to pay cash. He is a self employed plumber and often takes cash for services. This is basically so he can avoid paying taxes. He therefore wants to pay cash for obvious reasons.
He is therefore stealing from the countries economy. Therefore people who are PAYE have to make up this shortfall in money by paying for people who avoid paying their fair share.
He didn't like it when I asked if his children went to a private or state school, if he ever used a doctor/dentist/drove on roads etc etc. and then asked him who he expected to pay for their education stc.
Sooner cash is a thing of the past and all earnings can be traced and people pay their fair share the better for me.