The second reason why the Index is troubling is because our prosperity is not widely shared. It is a story the Index has been telling for many years, but in this 2014 installment the gaps and disparities are more pronounced than ever. These are the hard facts: our income gains are limited to those with ultra high-end skills. Median wages for low- and middle-skilled workers are relatively stagnant and the share of households with mid-level incomes has fallen in Silicon Valley more than in the state and nation. Disparities by race are more persistent than ever. We also saw a sharp increase in homelessness.