The second challenge will be reverse causality – GDP effects the number of users,

Attached are the paper guidelines as well as comments from the professor relating to our original proposal. It’s 10-15 pages with graphs. Here are his comments “This is a good starting point but still too simple for a proposal – specifically, what other variables do you think are important that could potentially be driving this relationship? You don’t mention any other variables you can use. And of course you want to go beyond a graph, but use regression analysis. The second challenge will be reverse causality – GDP effects the number of users, but the number of users can also affect GDP. This is more challenging to disentangle.”