[宏观经济学政策] 求教：规则对判断（相机抉择） [推广有奖]

下文中的公式能否一般化？谢谢

14-2 Should Policy Be Conducted by
Rule or by Discretion?
A second topic of debate among economists is whether economic policy should be conducted by rule or by discretion. Policy is conducted by rule if policymakers announce in advance how policy will respond to various situations and com-mit themselves to following through on this announcement. Policy is conductedby discretion if policymakers are free to size up events as they occur and choosewhatever policy seems appropriate at the time.The debate over rules versus discretion is distinct from the debate over passiveversus active policy. Policy can be conducted by rule and yet be either passive oractive. For example, a passive policy rule might specify steady growth in themoney supply of 3 percent per year.An active policy rule might specify that
Money Growth = 3% + (Unemployment Rate − 6%).
Under this rule, the money supply grows at 3 percent if the unemployment rateis 6 percent, but for every percentage point by which the unemployment rate ex-ceeds 6 percent,money growth increases by an extra percentage point.This ruletries to stabilize the economy by raising money growth when the economy is ina recession.