Before you think of moving to Belgium: US citizens can't escape the IRS, no matter where they live, and so do pay capital gains tax.
Apple, for example, is always extremely focused. Their products fit on one table.
Google's moonshots could get very expensive, especially if they venture farther into healthcare.
$20 billion R&D budgets can't be too hard to achieve. http://fortune.com/2014/11/17/top-10-research-development/
Supply-side made a lot of sense in the Reagan era, when we had near-runaway inflation and a massive cash crunch, so there was no capital to invest. Now we need things to invest the excess capital in. We need demand. That comes from wages, and no individual company is motivated to raise wages. Tragedy of the commons, in a sense.
Edit: Looks like you're referring to 2015 rather than present.