translation.en: The economist Joe Cortright did the math and he found out that those four miles plus those 11 minutes adds up to fully three and a half percent of all income earned in the region.
translation.zh: 经济学家 Joe Cortright 计算过 发现这四英里 加上这11分钟 加起来的总和约占 当地居民收入的3.5%