The United States loses, according to my estimates, close to $70 billion a year in tax revenue due to the shifting of corporate profits to tax havens. That’s close to 20 percent of the corporate tax revenue that is collected each year. This is legal.

Meanwhile, an estimated $8.7 trillion, 11.5 percent of the entire world’s G.D.P., is held offshore by ultrawealthy households in a handful of tax shelters, and most of it isn’t being reported to the relevant tax authorities. This is… not so legal.

These figures represent a huge loss of resources that, if collected, could be used to cut taxes on the rest of us, or spent on social programs to help people in our societies.

How do they do it? ............................