In the 1970s and early 1980s, the US economy slowed largely due to what has been called "stagflation", a combination of high unemployment and high inflation. IOTL, Ronald Reagan and Conservatives at large responded to this with Supply-Side economics, and despite the criticisms of "Reaganomics" it's been largely credited with the economic boom of the latter part of the 80s, into the 1990s.
But let's say Reagan hadn't been elected, or Mondale became President in 1984. What would the liberal response to stagflation have looked like? Would it have been that different from Supply-Side?