Quantitative historian Peter Turchin observed that demand for labor in the United States had been stagnant since 2000 and would likely continue to 2020 as the nation went through the negative part of the Kondratiev wave. (See above.) Moreover, the share of people in their 20s continued to grow till the end of the 2010s according projections by the U.S. Census Bureau, meaning the youth bulge would likely not fade away before the 2020s. As such the gap between the supply and demand in the labor market would likely not fall before then, and falling or stagnant wages generate sociopolitical stress.