It wasn't the best month for a 21-year-old to start his career by cold calling strangers and convincing them to buy a $10,000 piece of software. All budgets were frozen and the economy was in freefall.

I did well despite all the odds. It's possible to be the best salesperson in the world and break the 10-year record for most sales in a year. What is the way? I had a new perspective on how to sell when I worked on the first Obama campaign. It works no matter what the market is called.

Revenue can grow in a recession. The way you approach sales needs to be fundamentally changed.

In a downturn, money saved is worth even more than money earned.

Here are a few tips to help keep the revenue growing.

Adapt your sales pitch to the current market

Growth is the most important metric for executives and investors. Capital has always been cheaper.

All that has remained the same. Companies can't spend more than they earn. The old sales pitch of "We can help you grow faster than ever!" must be changed as well. The new message is "Let's get more out of your existing resources".