First off, wealth and power are the same thing and must be dealt with at the same time. So for a start…
Aggressive progressive taxation, up to 100% (billionaires - even 9-figure multimillionaires- must never be allowed to exist).
Abolish stock markets.
All companies must be employee-owned. Employees share equitable ownership of the companies they work within. Profits are shared only among employees.
Criminalize political spending, lobbying (aka bribery), etc. Candidates all draw from a public fund and platforms and that is all they may use.
Aggressive market regulation to protect competition and prevent consolidation. Our failure to protect the market from excess consolidation and integration is the primary reason we’ve reached the late-stage capitalism hellscape we currently exist within.
Again, this is a start… the tip of the iceberg.
There is a massive amount of leftist documentation on economics. We’re not all communists, but we recognize that any system devoid of regulation/oversight/accountability will always quickly travel rightward and become authoritarian. So the question is what systems and policies can be put in place to ensure not only equity for all, but equity that remains stable indefinitely (or as close as is possible).