The general idea is that if your workers are well paid and the store is well kept (if you would accept that "pay more rent" is generally the same as "spending m

The general idea is that if your workers are well paid and the store is well kept (if you would accept that "pay more rent" is generally the same as "spending more on the building") then customers will be more happy/satisfied and thus return more often, spend more, and recommend your store to friends thus increasing your revenue.