When the State does some social engineering with the various tools available to them, specifically taxes, I am always curious to discover if it worked out as intended, if they hit their goals, if it had less of an effect than expected or more or just what they expected, etc. Sometimes we are made aware of the results with various headlines and reports, but more often than not, we rarely seem to hear any follow up. I guess if you were really researching it you could find out, but the general articles on these things are often scarce, unless there is a particular interest in the matter.

The taxes on plastic bags in supermarkets is actually one of those things that has actually been followed up decently with the occasional article in general media letting us know how it is going. Maybe because it was so successful, I don't know.