The birth of the staffing industry began in the United States after World War II when small agencies, located in urban areas, began employing housewives for part-time office jobs. Through the years, the advantages of having workers who could be quickly onboarded/off-boarded, exempt from paperwork and excluded from regulatory requirements resulted in a gradual, but substantial, increase in the use of temporary workers. Currently the United States is estimated to employ approximately 10 million contingent workers.