How did the Romans help preserve the earlier Greek culture?

They built public buildings and the churches they built were more complex and more expensive. But they preserved literature by using Greek and Roman plays as textbooks and they studied them.

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

porter is writing economic history because he is focusing on the cost of developing vaccines.