US Workers' Wage Expectations Unexpectedly Collapse

Cue the latest economic (and Phillips curve) paradox.
On one hand, the US unemployment rate is at a 16 year low of 4.4%, suggesting little if any slack in the US economy, and according to anecdotes from both the Fed's Beige Book and industry sources, labor shortages are so acute that - if one believes the recently discussed report from the NAHB - up to 75% of builders are unable to find construction workers.