Corporations: downsizing, outsourcing, generally employing less in number and requiring more per workload.
Government: enabling outsourcing, making certain decisions that encourage/discourage hiring (etc)
Individuals: insistent on living in an area with less options or a lengthier commute, unwilling to relocate to find employment, not saving money to carry through hard times or put towards relocation, poor education choices or busines choices (like my brother in law who is still in sales - income depends on sales success), and being satisfied being unemployed (for some) - letting their mood affect their efforts to find work.
Towns: being ok on relying on one main means of employment for income - if the company goes broke the entire town suffers.
and so on.