What's one of the ways that economic changes affected Europe during the middle ages?

Answer 1

One way it changed Europe was that it caused the collapse of feudalism. It gave rise to nations and Central governments, not fiefdoms. Cities got bigger and became more autonomous. It gave rise to a money economy, including business partnerships, credit, banks and double entry accounting. Cities grew to the point that they became separate from lords. They had their own charters and governments. They created guilds for their artisans. This was a far cry from just agriculture.

Answer 2

Well, one thing I know is that the permission of trade between the Arabs and the Venetians with regard to pepper gave way to certain economic changes allowed for the rise of the Renaissance period. The Venetians started becoming rich thanks to the pepper trade. These rich Venetians were the ones who started the commissioning of paintings from artists of that time period...

Another thing is the discovery of the "New World" which allowed for the influx of goods (food products, especially) which allowed for increased trade as well. Basically, this ushered in a new phase in European history (and no longer were the middle ages)