Ask people how they think their work contribute to the cash flow of the company. Ask them to consider what impact them not working would have on the cash flow.

Ask people how they think their work contribute to the cash flow of the company. Ask them to consider what impact them not working would have on the cash flow. If their salary is greater than the income their work generate, then their work is actually not beneficial to the company. If they interrupt people who do have a positive impact on cash flow (unnecessary meetings) then it is even worse.