| I don't think we need to make specific references to substitution or substitutable products. |
| Seen from the customer angle, the products which fall under such a product market are not substitutable or are only so to a slight extent. |
| Strategic resources are valuable, rare and imperfectly imitable and substitutable. |
| Indeed any prohibition must have its own specific justification, which means that it is not possible to rely on bases that are supposedly complementary or partly substitutable. |
| These issues are source-based taxation, neutrality among substitutable economic returns, and tax consolidation. |
| He assumes that workers of different types are not easily substitutable for each other, but that immigrants and natives within each category are. |
