What’s behind the rise in U.S. inflation?

TEHRAN - This week, the U.S. labor department announced an increase in the consumer price index (a basket of products ranging from gasoline and health care to groceries and rents). The CPI has risen to 6.2% compared with the same period last year. The announcement means the country is now facing the highest annual inflation rate in more than 30 years (since November 1990).