There are many reasons as to why cities prosper and decline, but one of the key elements is how much fresh labor supply a city is getting, in other words its rate of immigration. As our older generation retires, the need for healthcare workers increases. A booming city is sometimes associated with a striving healthcare industry. Working in healthcare is one of the top professions for immigrants, therefore immigrants are vital to the health of a city, literally and metaphorically. Immigrants are also a lot more likely to create small businesses than the native-born population. By creating unique and culturally diverse small businesses, immigrants help make our cities more vibrant and more desirable to live in.