[quote name='bmulligan']You're incorrect. Kennedy signed a major tax cut and the economy blossomed. Reagan had similar results. Economists have not given up on the theory, but it has its limits.[/quote]
It depends on how one defines success. Bush's tax cut was VERY successful, for instance, given that you believe that the economy would be in far worse situaiton than it is now. You juggle the numbers enough and you can prove anything.
And it depends on which taxes are cut.
Quite true. So would this be agreement that Bush's tax cuts were badly made?
While you're right that stock prices have no bearing on company performance due to the fact that is has nothing to do with their capital influx, cutting the capital gains tax on investment income can be a powerful boost not only to the stock market, but to individual companies who issue more stock, or go public. It does give more incentive to invest, which is necessary for growth. The stock market is not 'broken', it's always functioned in this manner.
I certainly hope you're joking on that last point. Limited-liability corporation (and their stock) bear absolutely no resemblance to what they were originally created to be. Limited liability corporation status was (for the most part) created in the 19th century as an extremely narrow set of rights granted to a company (usually several companies working together, actually) as long as they functioned within the greater public good. The main reason for granting this status was the need to build a national railroad system, a project far too big for a single company, so some corporations were formed and granted 'extra' rights to accomplish this. The key limitation here was that if and when it was decided that the corporation was no longer acting for the greater public good, the status could immediately be revoked.
The stock that the corporations issued was based on direct ownership of the corporation. If you owned 25% of the stock, you quite literally owned 25% of the company. Because the corporation could be disolved at any time (and most of them were skirting that edge constantly because of greed and corruption...), the value of the stock was pretty much directly tied to the value of the corp - if the corp. was worth $15M and had 1M shares of stock, the stock was worth $15, since there was never any guarantee that the corp. would be there next month. The main incentive for buying stock generally came from dividends, which were generally just considered interest on an investment.
The biggest change to corporations came from what was probably the single most bizzare court decision ever: a lawyer actually argued in court that corporations were not merely a collection of contracts, but were in fact virtual people, with all the rights of a real human being. Somehow, a judge bought this, and the era of the corporation began.
After that things get a lot more boring. The role of corporations and the laws that they function under have continued to change constantly, but its mostly a bunch of boring small changes that I'll just skip for now (Unless you're really interested

) The key is that the ownership of a corporation and its stock have mostly been broken. The biggest divide is between limited (the 'real' stock) and unlimited stock (loans the company has no intention of paying back, ever.) The latter exists to sucker newcomers to the stock market into investing their money in what are ultimately worthless scraps of paper. One of them 'the rich get richer and the poor get poorer' sort of things.
Getting back on topic, though...
but to individual companies who issue more stock
How often exactly does this happen? Answer: pretty much never because it dillutes the value of the existing shares.
Still doesn't help the company much, because their stock is already owned by IC firms. The only people who make money are a few multi-billionaires who once again will do little more than continue to buy up more stocks increasing the value of the stock market without actually creating real value.
Cutting payroll taxes is a better way to reach the average middleclass and lowerclass worker and usually has a more immediate impact on the economy.
Quite true. Too bad Bush decided to throw most of the tax cut at the wealthy.
So in other words, you reduce the number of people breaking the law by changing the law so that what they were doing anyway isn't illegal anymore.
You cannot equate this with all other law breaking. All tax collection is punative, with no crime being committed. A better analogy would be parking ticket amnesty. Detroit and Ann Arbor, MI have gained enoumous compliance and revenue from eliminating penalties for these 'law breakers'. A criminal is more likely to skip bail when facing 20 to life, but more likely to plead guilty if he's only facing 90 days in the slammer for the same crime.
Bad analogy, simply because people virtually never just skip out on their taxes entirely: doing so generally tends to involve getting caught very, very quickly. Realistically, people cheat on their taxes. Lets just say we have someone who SHOULD pay $2M per year in taxes. Instead, he'forgets' to report a few sources of income so that his only pays $1.5M per year. What you're proposing is that we should lower what he really owns to $1.5M - hey, we have more people compiant, right? Realistically, he's going to keep right on 'forgetting' to report some of his income and now only pay $1M.