I think it does not stand for anything specific
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Historians get their information from two different kinds of sources: primary and secondary. <span>Primary sources </span><span>are first hand sources; </span>secondary sources<span> are second-hand sources. For example, suppose there had been a car accident. The description of the accident which a witness gives to the police is a primary source because it comes from someone actually there at the time. The story in the newspaper the next day is a secondary source because the reporter who wrote the story did not actually witness it. The reporter is presenting a way of understanding the accident or an </span>interpretation<span>..</span>
As the veterans came back, they returned to the workforce in large numbers to fight for jobs with existing workers who had entered the workforce during the war, unemployment shot up due to the limitation of jobs. The government wasn't worried about this, it was more worried about possible inflation.
Hope I helped. :)