I would interested to see your evidence that they have high economic productivity?

Technologies that reduce environmental impact while increasing economic productivity exist.

Nor is there reason to believe that economic productivity would change much.

The proponents of Web services say it will lead to big gains in economic productivity and convenience.

The promise of these so-called Web services is a big increase in personal convenience and economic productivity.

Broadband investment and services not only stimulate economic productivity, but also help create jobs.

If it is not, our nation will experience reduced economic productivity and become less competitive.

There is strong evidence that research spending - and having more scientists - leads to greater economic productivity.

One possibility is that economic productivity must be learned by doing.

What would prevent Congress from regulating any activity that might bear on a person's economic productivity?