First of all, "anyone who understand economics" understands that "supply and demand" is a generalization, not the only two variables in a void. More relevantly

First of all, "anyone who understand economics" understands that "supply and demand" is a generalization, not the only two variables in a void. More relevantly though, it is a "Policy Miracle", i.e. the writer is saying it's a miracle that an effective policy was finally enacted. In the second sentence: "but Governor Hochul finally made the right decision". The writer also praises how effective it is, not just that it is effective.