Mexico's headline inflation likely slowed in the first half of May for the fourth consecutive 15-day period, a Reuters poll showed on Monday, reinforcing expectations that monetary policy will remain on hold for an extended period. • Headline inflation for the first half of May is expected to ease to 4.13% year-on-year, according to the median forecast of 12 analysts polled by Reuters. • Consumer prices are forecast to have fallen 0.15% from the preceding half-month period.