You'd have to specify *how* prices and incomes policy has improved flexibility and productivity as well though...
Since wages are now tied more to productivity (rather than indexed to inflation as with the accord), there are incentives for workers to improve productivity - wage increases may also then not lead to cost push inflation (which will inhibit future growth). Employers and employees being able to an extent to determine their own contracts of employment create greater and provide flexibility for workers to determine their conditions. Can to an extent be evidenced by the rise or part-time employment...(has decreased unemployment levels, because even if someone is underemployed - i.e wants to work full time but is only working part-time, they are counted as being employed...)
Flexibility is enhanced by diminishing union power and by deregulating the job search industry (not long ago there was no monster, career1, seek etc...only the govt one, CES i think it was called...)