When a partner doesn't come into a shift, the responsibility of that person is placed among the ones who did show up. I believe that an equal opportunity for all of the present workers could be dividing the pay of the person who didn't show up by the number of present partners. For example, if the baristas make $8.35 an hour and one of them doesn't show, that amount could be divided by the number of people in the store during their shift.
Why is this important?
When partners don't show, it puts a lot of pressure on the present baristas to make every moment matter. If we have an incentive for working hard while a partner is missing, were more determined to push through and work hard.