Earlier quoted context omitted.
I'm coming around to the opinion that taxes on income are a bad idea. Income flows to people as they're trying to accumulate wealth, trying to climb from lower to middle to upper class. Higher taxes on income, especially highly progressive taxes, make it harder for people to move between social classes. The focus on income tax creates a situation where the person who makes $200k/yr but has a net worth of $0 gets taxe…
One big issue is feasibility: It's much easier to track, meter, and tax income as it changes hands than it is to track/meter/tax accumulated wealth.
Stocks are traded on public exchanges. Land and buildings stay in one place. Private jets need to land at airports and they each have a tail number. Most things to be sold efficiently are sold in public marketplaces. There are probably some assets that are hard to track, just like there is currently income that is hard to track. Some people are paid in cash and don't report it. A whole multi-billion-dollar black market of drugs, prostitution, etc. exists that is largely not income taxed. It happens. But in general income tax works, and a wealth tax would too.