So far there is no reference at all in this story to the issue of labour supply: thatis, how many workers are willing to offer their services in return for a wage orsalary. We have only considered the demand side of the equation: that is, how manyworkers do employers need, given their investment and production plans. Indeed,there is no particular reason why employment (which depends on business output)should ever equal the number of people who wish to work. In other words, there isno reason to expect full employment (see box). If there is not enough investmentand production to usefully employ all willing workers, then unemployment willexist – and capitalism has no sure-fire internal mechanism to eliminate it.
This paragraph shows that under capitalism, employment depends on business investment and not on the number of people willing to work. Since there is no automatic balance between labor supply and demand, unemployment is built into the system rather than just a temporary issue. Does this mean unemployment is a necessary feature of capitalism, rather than a flaw that can be fully fixed?