I find it ironic that conservative governments concerned with reducing deficits are also the first to cut income taxes.
An argument is that with lower income taxes, people earn more (after tax), and/or businesses can pay more people what they are worth (a fixed wage-bill can be spread thinner, but less top-sliced to no net disadvantage),. This money then gets spent, fuelling the economy, driving up business, skimming more off in purchase-side taxation and probably business rates as well, increasing wealth all round.
The problem is that lower earners are in thrall to the people who pay their wages (higher earners) who may not pass on the advantage and may just cleverly arrange things so that they are creaming off the bit not longer asked for in tax (by fair means or foul) to pay themselves and benefitting from their own lesser tax cream-off, and beggers can't be as much choosers. There are rules (and unionised pressures) against such sharp practices, but there are rules against loads of things which the rich find ways to circumvent.
So, perhaps a form of 'wage multiple' restriction. By some metric (dimensions of the hierarchy concerned) company bosses can't earn more than X times the lowest earner in their company, to encourage more pay down the line to 'allow' more pay at the top. With regulations to prevent tricks of accounting (bonus shares in leiu, enhanced company pension contributions, or somesuch)... And then there's offshore tricks (already employed) to disavow earnings under a jurisdiction's tax laws and take the hit somewhere else where its less punitive (or nog punitive at all), and the argument is that this happens more. But perhaps if proper (international) are not only made (as they are) but also
enforced... Well, what a wonderful world it could be.
Pipe dreams, naturally. It's a problem that better and more educated people than me have failed to solve. Even socialist systems still inevitably produce their Napoleons to counter their Snowballs, so that's probably idealist bunk too.