Immigration policies should not be a Noah’s Ark.

Sir, you are absolutely right when in “Small steps needed on US immigration”, June 12, you insist on the need to build credibility, which is exactly what some of us are trying to do by for instance developing a private insurance programs destined to guarantee that workers with visas issued under temporary programs will return in a timely way, or else paying some very substantial indemnities. What is not that clear though is why you think that creating bureaucratic biases in favour of high skilled workers is a naturally good thing to do instead of allowing the market to signal its own and very dynamic relative worker shortages. One thing is a Noah’s Ark in times of flooding and quite a different thing when it remains in the same spot, on dry land.