The trickle-down theory can be examined using the tools of econometrics. But, at least for the US, no such sophisticated analysis is required. The raw data on income distribution shows that households in the bottom half of the income distribution gained nothing from the decades of market liberalism. Although apologists for market liberalism have offered various arguments to suggest that the raw data gives the wrong impression, none of these arguments stand up to scrutiny. All the evidence supports the commonsense conclusion that policies designed to benefit the rich at the expense of the poor have done precisely that.