| But countries often face difficulties satisfying these optimality conditions. |
| The concepts of avoidability and optimality can lead to quite different outcomes. |
| Even if two biological parents statistically provide the optimal parenting situation, optimality is too high a standard for permitting parenting. |
| Conversely, in a macroeconomic approach, the question of the optimality and the sustainability of such imbalances is a pressing issue. |
| However, this optimality property does not hold for heteroscedastic models. |
| On the contrary, it would violate individual property rights on grounds of presumed optimality. |
