The photolithography machines that you need in order to pattern silicon for etching features smaller than ~20 nm or so are made by one company -- ASML. One mach

The photolithography machines that you need in order to pattern silicon for etching features smaller than ~20 nm or so are made by one company -- ASML. One machine is about the size of a house, costs >$100 million, and their order book is full for at least the next two years. A semiconductor fab typically needs several of these machines (maybe only one or two of the best machines for the smallest layers, but more of the coarser machines for the less dense layers) in order to produce chips competitively.