I agree with the spirit of your comment, but FB certainly CAN pay 15% raises to their lowest paid employees - I imagine w/ very little impact to their bottom line.
Nothing grows 15% compounding every year. Not even cancer. 15% compound growth is a motherfucking financial singularity.
If everyone does that, then you have just started running faster to stand still. They should back initiatives to build more housing in the area.
Its not about a 15% raise today, it's about a 15% raise every year indefinitely. Rents are increasing at 10-15% annually, no company can afford salary increases of that year after year after year.