Illegal immigrants and the economy

Illegal immigrants contribute both positively and negatively towards the United Sates economy. These immigrants are a cheap source of labor, will do the essential jobs that nobody else wants to do (such as cleaning or construction), buy our products, and leave before they collect their social security checks (thus leaving it in a surplus). All of these things boost our economy and in some cases, are essential. However, there are also some negative aspects towards the economy. The immigrants' children devour our tax dollars by attending public schools, the immigrants themselves sometimes make so little that they never pay taxes, and both use public transportation and public health care.
Everyone is affected by these immigrants' effect on the economy, but some are more than others. For example, entrepreneurs who benefit from the cheap labor and the increase in consumers, lawmakers who are passing new policy about taxes, public schools, and health care, and stock brokers who bid on different companies would all be wise to examine the immigrants' effect on the economy.