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Choose ALL the CORRECT statements: \"When faced with income shocks, households may not be able to smooth their consumption due to credit market exclusion that hinders their ability to borrow." \"In an increasingly integrated world economy, all else equal, a booming world economy may increase the potential for ination pressure within a country.\" "Any estimate of potential output will have shortcomings and, for this reason, policy makers do not use output gap to make policy decisions.\" _ \"When the economy is at its potential output, unemployment is equal to zero"