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Alaskans are faced with a stark fiscal reality. Following the discovery of oil in the 1960s and 1970s, state lawmakers repealed their personal income tax and began funding government primarily through oil tax and royalty revenues. For decades, oil revenues filled roughly 90 percent of the state’s general fund.

In recent months, the Tax Foundation has used its Taxes and Growth Model (TAG Model) to estimate the impact that a variety of tax policy changes would have on the nation’s economy–including tax plans proposed by current presidential candidates.

The Tax Foundation describes the underlying “logic” of its TAG Model as being rooted in the assumption that “taxes have a major impact on economic growth.” More specifically, the TAG Model has concluded that proposals to lower taxes for high-income individuals and businesses would dramatically grow the economy, and that proposals to raise taxes would significantly slow economic growth.

Many states’ transportation budgets are in disarray, in part because they are trying to cover the rising cost of asphalt, machinery, and other construction materials with a gasoline tax rate that is rarely increased. A growing number of states have recognized the problem with this approach and have switched to a “variable-rate” gas tax under which the tax rate tends to rise over time alongside either inflation or gas prices. A majority of Americans live in a state where the gas tax is automatically adjusted in this way.

The federal government and many states are seeing shortfalls in their transportation budgets in part because the gasoline taxes they use to generate those funds are poorly designed. Thirty-one states and the federal government levy “fixed-rate” gas taxes where the tax rate does not change even as the cost of infrastructure materials inevitably increases over time. The federal government’s 18.4 cent gas tax, for example, has not increased in over 22 years. And twenty states have gone a decade or more without a gas tax increase.