The private and public sectors are not substitutable: they are interdependent.
2
That is a worry for other firms hoping to sell substitutable generic Advair in the big U.S. market.
3
However, the bigger threat to GSK will likely come from fully substitutable generic copies of Advair that are still awaiting approval.
4
The exposed sector is a two-level CES where highly and lowly productive labour are complementary, but both are substitutable with minimum wage labour:
5
Mass industrial tourism is based on the assembly, distribution and consumption of packaged products and, as a consequence, one product is substitutable for another.