Because Dave Ramsey told me to!
Research tells us that you spend more when using plastic; you register no emotional pain when you spend with plastic.
From my eBook:
For me personally, I’m a very visual person. If I see that I have $15.00 in my wallet and I still have more groceries to buy, I automatically reduce my grocery list. Even if you “only” save $1.00 every week by doing this, that’s $52.00 a year you didn’t have before.
Read more posts about using cash when grocery shopping.