Last week, the Federal Reserve hiked interest rates for the eighth time in less than a year, sending benchmark rates to their highest level since 2007. For a mortgage market that has seized in the wake of higher financing costs, another rate hike would seem to be bad news. But Nadia Evangelou, senior economist at the National Association of Realtors, says the slowing pace of hikes could offer markets the type of certainty that could revive mortgage demand.