How often do you carry cash?

I highly doubt it. Credit score is a measure of your creditworthiness, meaning how likely you are to repay your debts. Should not have anything to do with if you used your credit card for a $1 purchase.

The reason why some merchants put a minimum purchase limit is that they have to give a small % of their charge back to the credit card company, and for smaller merchants this is not worthwhile for small purchases. Large retailers and merchants will have volume discounts so they do not care. I have frequently used my credit card even for a $1 purchase at McDonalds or the grocery store.

 

I always carry cash around £10-£20 for emergency & ccs for my purchases..its better to buy using cc as its very easy&safe to carry,can track our expenses easily,earn reward points,can save interest as I will pay my cc bill within grace period..