One factor that contributes to making cash slower in USA is the fact that the price displayed isn't the price you have to pay (because of taxes added at checkou

One factor that contributes to making cash slower in USA is the fact that the price displayed isn't the price you have to pay (because of taxes added at checkout time). You end up having to handle random amount of small change for something that ended up being $10.21 (but advertised as $9.99). In most EU countries, the item would be priced at €10, you would pay with a €10 bill and move on.