如果美联储宣布可以接受4%的通胀率，那么公众是会把这当做美联储在虚张声势，还是认为既然通胀目标可以提高一次，那么就能提高第二次？
If the Fed announces that it will tolerate 4% inflation, could the public think that the Fed is bluffing, or that, if an implicit inflation target can be broken once, it can be broken again?