Which model shows households supplying factors of production and firms supplying goods & services?

While Greece may allocate resources towards olive production, this statement does not imply a conclusion about comparative advantage. A country can focus on a product without having a comparative advantage in that area; comparative advantage is determined by opportunity costs, not just resource allocation.

This statement may or may not be true and does not directly relate to the concept of comparative advantage. Italian winemakers could be more productive, but that does not negate Greece's comparative advantage in olives. Productivity levels do not dictate comparative advantage but rather the opportunity cost associated with producing different goods.

The slopes of the PPCs represent the trade-offs between the two goods produced by each country. If Italy has a comparative advantage in wine and Greece in olives, their PPCs must have different slopes to indicate varying opportunity costs, reinforcing that they cannot be identical.