Shonkwiler, J. Scott

By: Li, Yunhan; Shonkwiler, J. Scott
We re-examine the existence of cattle cycles based on U.S. beef cow inventories from 1979 to 2019. Our analysis begins with a basic first-order stochastic cycle model and finds a cattle cycle of 16.54 years, significantly longer than the presumed 10- to 12-year cycle. Typically cycles become longer before they disappear. Upon further investigation, we re-estimate the length of the cycle by applying a second-order stochastic cycle model which improves goodness of fit. Surprisingly, the cycle length is estimated to be infinitely long, implying the complete disappearance of the beef cow cycle.
By: Bergstrom, John C.; Stowers, Matthew; Shonkwiler, J. Scott
Using a first-difference econometric model, we estimate an aggregate demand model for assessing the determinants of the quantity of visits to the 47 national parks in the continental United States. The estimated model was then used to project visitation to these parks from the 2016 base year to 2026. Total visitation could see an average increase of about 1.2 million visitors per year through 2026, suggesting that congestion problems already experienced at many parks may get worse. Congestion and overuse strain already limited operation and maintenance budgets and can lead to environmental damage to park sites and reductions in visitor satisfaction.