This is super interesting. I've hear many people make the argument that leagues like the bundesliga or la liga aren't as competitive as the PL but I feel like if that were the case, it would be easier for the top teams in those leagues to accumulate more PPG because there'd be a larger supposed gap in quality from the top teams compared to the others, ergo less competitive league. This graph seems to disconfirm this hypothesis as the PPG of the top teams between the PL, bundesliga, and la liga are fairly similar.