Suppose that in the fictional country ASU in 2012, a mandate was passed where everyone between the ages of 23-25 will receive health insurance at a discounted rate, while individuals aged 27-29 were not impacted by this policy. You, a researcher, want to study the effect of offering discounted health insurance coverage on the use of mental health services. You have data on the average number of visits for these two age groups over time. Using the information in the table below, a quick difference-in-difference calculation suggests that the mandate led to _____. Age group Time Periods Avg. Number of visits Pre-2012 Avg. Number of visits Post-2012 23 to 25 2.3 3.0 27 to 29 2.5 2.9