THE economy is growing again, thanks in part to President Bush's tax cuts, but high productivity has been keeping unemployment high -- until lately. Just last month and this, there have been signs that things are getting better. Small signs, but important signs. In September, the number of net jobs in the economy went up for the first time since early in the year. The number wasn't huge, just 57,000, but the positive direction gave economists hope. Then last week, there were fewer people putting in claims for unemployment insurance than anytime since early in the year. The high productivity...