She proposed a "one London, not two" test for policy-makers.
While Bai writes disdainfully of liberal "litmus tests," a political party would be insane not to "test" for policies that are popular - or for those that would be if they were given a chance to succeed.
In 2011, a moratorium on the use of predictive testing for insurance policies with high payouts was extended until 2017 [ 42].
FIRST TEST FOR BAG POLICY The N.F.L.'s new policy banning bags that are not clear and that are larger than a gallon food-storage bag seemed to have worked well at the Hall of Fame Game.
"The litmus test for any policy is, what impact does it have to improve productivity or demographic growth?" America's stagnant outlook is important: Debt is a bigger burden in slow-growing economies.
As luck would have it, a test for the policy comes with the mooted closure of one of the most controversial new cultural buildings in the country, The Public in West Bromwich.
Because of the horror it endured a three-year war in which about 2m people, or half the population, were displaced and 100,000 or more people were killed and also because of the high ambitions of the Dayton peace agreement, sealed in 1995, the country is a sort of litmus test for international policy in the Balkans.
We test for each policy two different scenarios regarding the possibility of internalization of the CO2 externality.
Because if that's the test for public policy, it's abortion on demand and gay marriage all around!
Rather, it is the aspiration and test for economic policy: Does it both raise the tide and lift all boats?
The Great Recession has posed a severe stress test for these policies, with some commentators arguing that they are at best "fair weather" policies.
