An article in the Economist observes that a sudden unanticipated spurt of inflation could lead to rapid

Question:

An article in the Economist observes that "a sudden unanticipated spurt of inflation could lead to rapid economic growth."
a. Briefly explain the reasoning behind this statement.
b. Does it matter whether a spurt of inflation is unanticipated? Might different economists provide different answers to this question? Briefly explain.