"There are two key reasons for doing that," he said.

One key reason is that almost all the group's members also own coal plants.

A key reason for the buying power is a still strong employment market.

A key reason is its aggressive approach to economic development.

Political pressure to keep costs down was a key reason for the use of cheap designs.

High costs are the key reason that many go without insurance.

This is the key reason there's been a big change in the focus of diabetes management.

Differences in labor law and public policy are a key reason for this decline.

"And the educational program is a key reason why that's true."

There are two key reasons as to why this remains the case.