In such an environment, earnings will be the primary driver of stock performance.

Over the long term, improvements in technology have been the primary drivers of progress.

In the last decade, new technology has become the primary driver of the industry.

"Right now, it's not the primary driver of why you buy the phone," he added.

"The primary driver is the numbers they have to deal with to reduce the deficit," he said.

The primary driver for instability within the country has been the regime's security forces.

These deep changes constitute a primary driver of economic growth in developing countries.

It is a game in which the player runs their own race team, acting as the primary driver.

No matter the primary driver, the stock has grown expensive by several measures.

"The Internet is the primary driver of our business today," he said.