Stocks are deflated because they aren’t expected to earn because people aren’t out buying and companies aren’t earning. Same for oil. Same for airline tickets. It seems obvious that there is deflation. If you have a good paying job right now, you can buy a lot for less.

Given that food and medicine make up a large portion of spending, I think we'll see something more like, "some prices go up and others go down."

Another big chunk is housing, which as far as I know, shouldn't expect much difference in supply or demand in the short term, though demand may increase (at least as measured by square footage) if people are staying home for a long enough time. That may be countered by the reduction in demand for real estate by businesses, though zoning will probably limit the short term effects that has on housing.