Revenue
As process node technology gets ever more complex, it costs big dollars to develop and then building chips on the process is also a very costly process. The big foundries often have many process nodes running in parallel across a wide range of price brackets in order to both diversify the revenue streams but also offer multiple competitive options for the market. The latest numbers out of TSMC are stating that in Q4, the revenue generated from their leading edge 7nm node family now takes the biggest percentage of revenue for the company.