In JPMorgan Chase's "Investor Day" presentations, the card services presentation contained some year-over-year numbers for sales volumes (which I think includes both credit and debit card puchases - see page 44).

Travel is being cut back with airlines down 6.7%, hotels/motels down 9.2% and travel agencies down 17.3%. Since travel consumes a lot of energy, this should also be helpful to the environment.

Shopping in expensive stores is declining, with department stores down 12.0% and jewelry/watch/clock stores down 22.0%. I've never understood why people buy expensive watches in jewelry stores, since the cheap ones keep excellent time. And diamonds are notoriously associated with exploitation of miners and cutters/polishers, besides being used to fund warlords.

On the other hand, discount stores are down only 3.8%, which indicates that necessities are still being purchased.

On another slide, they showed that their "mass affluent" and "affluent/high net worth" customers are also using their cards a lot less.

So much for the argument that tax cuts for the rich will stimulate the economy.