DAVOS, Jan 24 – Ukrainian government has to work to promote "sustainable optimism," to do something the people would really believe in, said Economist Robert J. Shiller, 2013 Nobel Laureate in Economics.

"We need the optimism that we see now in Ukraine to be sustainable. We do not look at the latest growth numbers as an indication of success, but we have to look at how the culture is changing," the economist said at a Ukrainian breakfast hosted by the Victor Pinchuk Foundation in Davos on Thursday.