In preparing a proposal for a new park, we estimate our costs for running a park (a very labor intensive proposition), compare that to the revenues from the park, and bid a certain amount of rent we will pay each year as a fee for the rights to operate the park.

FORBES: Regime Uncertainty and Obamacare

Some important caveats here: TPC did not estimate the revenue effects of a Ryan tax proposal since the budget does not include an actual plan.

FORBES: House GOP Would Need $5.7 Trillion In Tax Hikes to Offset Ryan Rate Cuts