Your math seems right, but again you're neglecting the $120k cash bonus in your calculations.

>Price of A's RSU on Nov 3 2021 - $3384 * 150 = $507,600 Price of B's RSU on Nov 3 2021 - $3384 * 30 = $101,520

This is the correct price of the RSUs, but again, neglects the cash bonus. If you look at it (more correctly) through the lens of "the amount of compensation given", the price of A's RSU+bonus is $507k, and the price of B's RSU+bonus is $221k (your $101k + the $120k cash).

But! There's no reason that the $120k cash just has to stay cash forever. If you're considering the stock appreciation of the RSUs, you also have to consider the appreciation of what you can do with the cash. For example, if you're one of the Amazonians that just gets the cash bonus all paid up front, then you just take the $120k and buy 120 AMZN stocks to go along with the 30 you were granted as RSUs, and you end up with the exact same 150 stocks ($507k) at the end of 4 years. There's no difference. If you get paid the cash bonus monthly instead of up front, then you would come out a little behind since you can buy less AMZN shares as time goes on, but not as drastically as your numbers make it look.

> This is the correct price of the RSUs, but again, neglects the cash bonus. If you look at it (more correctly) through the lens of "the amount of compensation given", the price of A's RSU+bonus is $507k, and the price of B's RSU+bonus is $221k (your $101k + the $120k cash).

The difference is still almost ~$300k. Almost 1 extra year's income.

> But! There's no reason that the $120k cash just has to stay cash forever.

This is obviously a very simple scenario. There is obviously an assumption here that neither A nor B does any extra investing on the side and just hold onto whatever Amazon has paid them.

Individual investment into the stock market is a whole different can of worms. B could just invest that $120k cash in one of the r/wallstreetbets and lose it all. On the other hand, A could cash out all AMZN vests and invest that in TSLA.

The scenarios become endlessly complicated if we consider side investments in individual stocks.

I think, despite being grossly simplistic, this calculation may provide an interesting insight into why AMZN prefers to delay significant stock vesting for its employees, especially when other similar companies don't. Especially given the fact that avg. tenure at AWS (as per linkedin) seems to be 1.6 years. So a large number of AWS employees may not be receiving 80% of their stocks.

The problem is that your calculations aren't just "grossly simplistic", they completely ignore the cash bonus, which again, is the entire problem. The cash bonus is a core part of the compensation strategy, which means you must include consideration of it in your calculations for them to be accurate, but you did not do so.

Even for the person who receives $150k in RSUs, they are still simply receiving a dollar amount. It doesn't matter if it's in AMZN stock or if it's in cash, because the cash amount and the AMZN stock can be exchanged equally, and B has just the same opportunity for stock growth as A has (because either of them can purchase whatever investments they want with the $150k they receive, regardless of it it's cash or a stock unit). If you aren't considering this, then all of your calculations about "which situation pays more" are wrong.

>The scenarios become endlessly complicated if we consider side investments in individual stocks.

And they become completely useless if we don't consider it. Attempting to simplify your calculations isn't a good reason to make them wholly inaccurate.

They also aren't "endlessly complicated". It's still very simple: any investment opportunity that A has, B also has, because they are receiving the same dollar amount of compensation that can be invested. So when comparing A vs B, there is no difference.

>So a large number of AWS employees may not be receiving 80% of their stocks.

Again, this doesn't matter, because they get cash instead of the stocks.

You are making the classic mistake that many make that imagines that RSUs are fundamentally any different than just receiving cash. But they aren't. Receiving an RSU for $3000 is the exact same thing as receiving $3000 cash and then using it to purchase $3000 worth of that stock. There is a reason that the IRS taxes RSUs vests just like normal cash income.