SINGAPORE (Nov 4): Proposals for a broad tax on wealth are not new, but they are receiving renewed attention in the US. Steadily increasing income and wealth inequality has raised social and ethical concerns, even among a subset of the wealthy. This trend, along with declining social mobility, is contributing to political polarisation, which in turn leads to poor and erratic policy choices. And we know from history that rising inequality and intensifying social and political polarisation can lead to more dramatic and even violent outcomes.

Fortunately, there is a growing body of first-rate research on the magnitude, dimensions, history and trajectories of income and wealth inequality. If there is growing demand for some type of tax-policy response to the problem, we have ways to determine which measures would be most effective, depending on the specific objective.

Listening to the contenders for the Democratic Party’s presidential nomination, it would seem that different wealth tax proponents have quite different objectives indeed. Bernie Sanders, who has said, “Billionaires should not exist,” seems to regard extreme inequality as offensive in and of itself. But others focus more on what inequality means for those in the bottom half or two-thirds of the income and wealth distribution. Elizabeth Warren, for example, wants to tax wealth to pay for an ambitious expansion of social security and other services.

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