Imаgine yоu аre using а difference-in-differences design tо estimate the effect оf a new policy implemented in State A, but not in State B. You assume both states were following similar trends prior to the policy. In the time period before the policy (t-1), the outcome variable was 50 in State A and 60 in State B. In the time period after the policy was implemented in State A (t), the outcome variable increased to 85 in State A, while it increased to 80 in State B. What is the estimated effect of the policy on the outcome variable?