General Query: The Price Model of Disney Theme Parks Over The Years?

This does deal with history and the historiography of the subjects evolution, and it would probably get stuck under the muck anywhere else so I'll just put it here unless its moved:

I've heard many stories which lead me to believe the price of getting into a Disney park like Disneyland was far less costly in the early days, and much easier (I believe I heard Terry Gilliam went multiple times opening day, when today a ticket costs 60 or so dollars a person).

So I'm curious, how has cost evolved over the years for the Disney parks in admittance price, cost of goods sold at the parks, and so forth?
 
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