This study examines the variation in out-of-pocket expenditures for he
alth services among different types of households and identifies the s
ocioeconomic variables important in determining these expenditures. Co
ntrary to the expectation that insurance coverage reduces out-of-pocke
t expenditures for health services, it is found that households with h
ealth insurance have higher out-of-pocket expenditures. This is strong
evidence of the presence of moral hazard in medical care markets and
adverse selection in insurance markets.