In ABI/Inform, try this search for quick results. If this doesn't return the kinds of articles you'd like, try the other methods outlined in Week 1 and Week 2.
SU.EXACT("Labor supply") AND SU.EXACT("Supply & demand")
In Business Source Premier, try this search for quick results. If these don't fill the bill, try doing your own thesaurus or keyword searches.
DE "LABOR supply" AND DE "SUPPLY & demand"