Who Would You Rather ?

I’m planning a trip to visit my aunt and uncle in Cambridge. We were talking about a day trip to London and the prices of travel were shocking. The train fare was bad enough, but I learned that the fare on the tube is four pounds. That’s a shocking amount (even when the exchange rate was much much better it would still be over $5). I can buy a monthly transit pass in Atlanta for $60 (about 30 pounds). I think if you don’t have a pass the fare is $2. I realize London has a much larger transit system, but are salaries in London that high? How do the people who live there afford it? Doesn’t the government subsidize public transportation? I know they have some system to limit the number of drivers in the city, but the best way to keep people from driving their cars in London is to make public transport (trains and tubes and buses) a much cheaper alternative. But my question is, how do Londoners afford transportation?