How does Fogel justify using only one year of data in his social savings analysis? Group of answer choices The year was the only time where there was data available after the railroad but before cars The year was pretty similar to previous years, and therefore he could use it to match other years There were no data available before the year he chose, so he was working with the best he could The data came after the railroads were already established, meaning that if the effect was small that year, it must have been even smaller in previous years.