To be livable, a city needs a balance between 3 things:<p><pre><code>  - Business (commercial real estate)
  - Housing
  - Transportation (streets, busses, trains, flying cars)
</code></pre>
The first 2 are easy, since they&#x27;re very profitable to the city and developers. But taxpayers don&#x27;t want to pay for transportation, and commuters are willing to tolerate horrible traffic and the resulting poor quality of life.<p>Does San Francisco have a good balance now? What if we doubled business and housing?