When a city comes up with a plan to reduce local poverty without addressing poverty in neighboring regions, is it not a plan? Of course it is. We make plans that control what's in our jurisdiction. Unless, of course, you're arguing for a world government. Maybe you're a big world government guy. Nah, I don't think so.
When California decided to keep strict emissions laws in place for auto manufacturers, despite the Trump administration rollbacks, what has occurred? Auto manufacturers are signing up to stick with the Obama-era California upheld emissions standards. Why? Because we're a huge consumer market. There are market effects outside of our jurisdiction if you're able to get things done inside of it. Surely you know that.
This is, I'm sorry, the most poorly thought out argument I ever hear. It's childish. I support higher tax rates on high income individuals. I fall into the category of high income. When people ask me why I don't just add extra to my taxes, it's a sign they lack any idea of how society works. What will add more to the budget? A little extra from me and two other volunteers in the whole country, or using the money I would have paid to support candidates who will get all high income earners to pay more?