Nine days later, the house was sold again - this time for $108,000.

"However, the networks are more likely to sell time to the political parties."

In 1985, it was sold again - this time for $7.5 million.

"It only enhances our ability to make money selling time."

At night, they sell time to independent producers who broadcast their own programs.

"Often there's only buyers, so you can't count on being able to sell next time at any price."

Then he took a job with an American firm that sold time on its computers to outsiders.

"It's our policy generally not to sell time for advocacy advertising or political issues outside of a national campaign," she said.

And where most subway images sell products, he sells time.

Right now, parking meters sell time and patches of space.