Donald Shoup is an economist who studied how cities can have better parking policies. He found that most cities charge too little for parking, which encourages too many people to drive and makes traffic and pollution worse. He suggested that cities should charge the right price for parking — not too much and not too little — so more people use public transportation and the parking spaces that do exist in the city are used more efficiently. He also recommends that cities use the money they get from parking to help fund improvements in public transit and bike lanes, so people have alternatives to driving and the city can be less polluted and congested.