In this equation, both a π {\displaystyle a_{\pi }} and a y {\displaystyle a_{y}} should be positive (as a rough rule of thumb, Taylor's 1993 paper proposed setting a π = a y = 0.5 {\displaystyle a_{\pi }=a_{y}=0.5} ).[6] That is, the rule "recommends" a relatively high interest rate (a "tight" monetary policy) when inflation is above its target or when output is above its full-employment level, in order to reduce inflationary pressure.