Allen Sinai made his first investment at the tender age of 10. Having tracked the US stock market with fascination for a couple of years, the Detroit native decided to invest in a company called Solitron Devices that wanted to outfit cars with semiconductors. He bought 10 shares at $15, and sold them at $300.
"It's always been about economics and markets for me," says Sinai, co-founder and president of Boston-based Decision Economics, the respected US economic forecasting firm.
Sinai is known