(Now, since this positive development occurred during Mr. Obama's reign, he gets the credit, right?)
I would like to be able to say, "It depends on whether or not his policies brought about this development" but we all know Presidents often take the credit or blame for things they had nothing to do with and likewise often don't get the credit or blame for thing that they did.
I was being facetious. I think giving any president credit or assigning blame for anything but broad policy that they effectively implemented is ridiculous.
George W. Bush did not cause the recession that began in 2008 during his term
Barack Obama did not cause the unemployment rate to stay so high.
BO did not make oil and gas prices go up.
We've seen it demonstrated that a huge portion of both the deficit and the debt escalation are attributable to the GWB tax cuts. So he gets much of the blame for those.
BO was effective at getting health care reform implemented. Since it has not completely gone into effect yet we do not know the long term impact. But once it is known, BO gets much of the blame or credit.