Unfortunately, we are at or near the point of substantially diminishing returns for this sort of stimulus.
Criminal penalties in Europe are substantially shorter than they are in America, yet Europe has fewer repeat offenders.
This year's projections are substantially worse than last year's--and much, much worse than 2009 and 2010.
mid-14c., "ample, sizeable," from Old French substantiel (13c.), from Latin substantialis "having substance or reality, material," from substantia (see substance). Meaning "existing, having real existence" is from late 14c.