This is a genuinely contested policy question where reasonable people disagree based on differing values and empirical judgments. I can lay out the main arguments on each side rather than pushing a verdict, since this isn't something with a factual "right answer" — it depends on value judgments about fairness, growth, and the role of government.
Arguments for raising taxes on the wealthy
Inequality and fairness
•Wealth and income inequality in many countries (especially the U.S.) have risen substantially since the 1980s, with top earners capturing a disproportionate share of income growth.
•Many high earners benefit from preferential tax treatment — capital gains, carried interest, and stepped-up basis on inherited assets are often taxed at lower rates than ordinary wage income, leading to situations where some billionaires have lower effective tax rates than middle-class workers.
Revenue needs
•Higher taxes on top earners could fund programs like healthcare, education, infrastructure, or deficit reduction without raising taxes on lower/middle-income households.
•Some economists argue there's room to raise top rates without significant harm to growth, pointing to historically much higher top marginal rates in the mid-20th century U.S. (70%+) during periods of strong growth.
Diminishing marginal utility
•A dollar matters less to a billionaire than to a median earner, so progressive taxation can increase overall societal welfare even if total income is unchanged.
Arguments against raising taxes on the wealthy
Growth and investment concerns
•Critics argue higher taxes on capital, investment income, or business owners reduce incentives to invest, start businesses, and work, potentially slowing economic growth and job creation.
•Capital is mobile — very high earners and corporations can relocate to lower-tax jurisdictions, potentially reducing the tax base rather than increasing revenue (the "Laffer curve" argument).
Already progressive systems
•In many countries, including the U.S., the top income earners already pay a large share of total income tax revenue despite representing a small share of filers.
•Some argue the existing system is appropriately progressive and that the real issue is tax avoidance/loopholes rather than rates themselves — fixing enforcement rather than raising rates.
Behavioral and practical issues
•Wealthy individuals often have more flexibility in how and when they realize income, meaning rate increases sometimes yield less revenue than static modeling predicts.
•Some economists worry about double taxation (e.g., corporate profits taxed, then dividends taxed again) and effects on retirement savings, small business succession, etc.
Where the debate often lands
Much of the actual policy argument isn't really "higher rate: yes/no" in the abstract — it centers on specifics like:
•Should capital gains be taxed like ordinary income?
•Should there be a wealth tax (on assets) vs. just higher income tax rates?
•How should estate/inheritance taxes work?
•What enforcement/loophole-closing measures would raise revenue without rate hikes?
If you want, I can dig into specific proposals (e.g., a particular country's current top rates, a wealth tax plan, or recent legislative proposals) and get more concrete with current data — let me know which angle interests you most.