Cap at StopBuyingCrap.com started a meme on Tuesday asking for readers to share the contents of the wallet with the blogging world. I'm not about to bore you with the contents of mine but I noticed that some of the respondents, like AllThingsFinancialBlog.com had little or no cash in their wallet. Which got me thinking?

In a society hell-bent on using plastic to pay for everything from your grocery bill to school fees I wondered whether there were any benefits to keeping cash in your wallet. I admit, most of my purchases are performed using my debit or credit card especially as our credit society charges no fees on these transactions. However, I still like to carry a minimum $10. Why?

Most places that offer EFTPOS facilities will only conduct a transaction if it exceeds a $10 limit. If I'm out at the DOME and I want to buy a coffee (cost $4) I don't like having to increase my purchase by adding a piece of overpriced cake to the order just so that I can pay for it. So I like to keep at least $10 for small purchases at any one time.

How about you? Do you have a minimum amount you like to carry in your wallet?