Around the !189-0's the Roman had a dictator who was later killed by their people, had created a law that all pregnancy would be had controlled by the government. They told you when you get pregnant and how many, while if you illegally ave birth you had to pay a fee. During this time in the US we did the opposite, we declared a law called Roe V. Wade that made all states legalize abortion. Now of course crime did't stop just because we approved abortion for 50% was because had more prisons, police strategies, gun control, crack decrease, and a strong economy. But because we approved abortion all unwanted children were never born, and if they were they would end up in a bad neighborhood, criminal, and homeless. So 50% was because criminals were never born and the other half because enforcement created by the government.
Incentives for students.
Incentives investigations or experiments to see or hope a great results, but incentives can never tell whats you outcome will be. Even though the government claims to always know and spend a lot of money on these projects, we can be hit hard back for its a probability that it can fail. The university Of Chicago offered and a incentive to a school offering the opportunity to see if they created an incentive for students to raise their grade will it persuade or influence to do so. By this every month their grades came out if they had C's or higher the earn $50 dollars, and get to be in a raffle to win $500 dollars. In the end the only students who seemed to raise were from the D's categories up to a C, but other than that the F's their was no improvements. So their incentives didn't make much of an impact as much as they had hoped.