Then the Goog enters the picture and is willing to add another $200k premium to that, in order to prevent you from working for that employer. This isn't sustainable; you're still you and your direct value to Goog is only $100k. The additional amount represents how much damaging a competitor is worth to Goog. As soon as the competitor goes out of business or Goog stops having piles of cash laying around to fight with other companies, that additional value evaporates.
If you decide to leave Goog, you should probably not expect to get $300k or more. In fact you may get less than $100k, if Goog has eliminated the competitors to whom you are valuable.
"Market rate" is extremely unstable.
This is true of everyone of course. Even a more or less commodity junior Javascript developer isn't worth much more than their generalized ability to do random tasks to a company that doesn't do any software development.
But some people have a skillset and track record that is very valuable to some companies but that would make it hard to be hired at most.
Imagine some market where 10 companies sell bread and it costs $5. And lets assume that the costs are $4 and $1 is profit.
Then comes a company that makes its money on selling water and it is doing very well. It comes to a bread market and starts selling bread for $3.
The competition is quickly destroyed and the bread prices rise.
Edit: as a sibling comment mentioned: https://en.wikipedia.org/wiki/Predatory_pricing
Maybe 50 of the other 99 bakers at the 10 bread-selling companies are also capable of making good bread and will feel bad, maybe the company that lost the baker will feel bad, maybe that company will even fail because it turns out that really was their best baker... but in that case, it just proves that the water company was paying the market price for that baker. Which they were.
Spending more on talent is not predatory pricing.
Yes it does: Google makes money from advertising, not from self-driving cars.
This is not possible according to the usual definition of "market rate".
If Google is willing to pay X, that is the market rate.
edit - I see how my post was misleading. I should have said X is a "lower bound" for the market rate.
This puts Google in the position of being a monopsony for the labor of programmers; that is, they're the only or primary buyer of that commodity. Part of antitrust laws is preventing that, so, yes, there is a problem if a monopsony arises, but Google isn't in that position anyway because jobs aren't completely interchangeable the same way programmers aren't completely interchangeable. For example, companies can compete on the basis of not being Google, which attracts some people. Companies can compete on the basis of being based in some other geographic location, or having other things to work on, or having a different mix of salary and benefits.
Google offering the highest salary doesn't mean they automatically get everyone. It means they get people who want the highest salary to do what Google's interested in as opposed to wanting to work on some kinds of technology Google isn't pursuing.
Single-firm anticompetitive behavior, as defined by FTC: (https://www.ftc.gov/enforcement/anticompetitive-practices)
Single Firm Conduct:
"It is unlawful for a company to monopolize or attempt to monopolize trade, meaning a firm with market power cannot act to maintain or acquire a dominant position by excluding competitors or preventing new entry. It is important to note that it is not illegal for a company to have a monopoly, to charge “high prices,” or to try to achieve a monopoly position by aggressive methods. A company violates the law only if it tries to maintain or acquire a monopoly through unreasonable methods."
Horizontal Conduct:
"It is illegal for businesses to act together in ways that can limit competition, lead to higher prices, or hinder other businesses from entering the market. The FTC challenges unreasonable horizontal restraints of trade. Such agreements may be considered unreasonable when competitors interact to such a degree that they are no longer acting independently, or when collaborating gives competitors the ability to wield market power together. Certain acts are considered so harmful to competition that they are almost always illegal. These include arrangements to fix prices, divide markets, or rig bids."
Staff aren't a product or commodity.
I have a relative who bought a very nice beach house from his legal fees suing a hospital network for doing something similar.
I don't think what you're describing is anti-competitive behavior, rather it's omni-competitive. Pretty much all the money Google throws at anything is "advertising money" but if they are really trying to make self-driving cars, what's wrong with that?
Should my Brad Pitt Summer Blockbuster profits not be able to bankroll my Teletubbies Christmas Special?
There's plenty of antitrust fodder already with their stranglehold over the web and the behavior they've taken to protect their search/ad business. But if they're hiring people away in cutting edge areas of research simply to destroy startups, that's abhorrent. That means they're pouring their obscene wealth from advertising into unrelated fields in order to dominate them.
Monopoly.
Yes, literally speaking, it's "worth it" to Google, or they wouldn't do it. Being so large, Google can throw advertising money on their self-driving car division, no problem. They can take a loss for 5-10 years, no problem. However, it's extremely anti-competitive, which is the problem others are pointing out here.