That is nuts to only compare base salary. At the big 4, base salary will be <60% of total comp. It's possible that Goog will hit really tough times and no longer pay the annual bonuses and it's possible they don't offer equity refreshes. But it's much more likely that Goog's business will hold steady (or grow) and the company will want to continue attracting candidates. It's much more likely that employees get refreshes so that their pay in years 2,3 and 4 are higher than the pay they were promised at sign-on. However, it's possible for pay in the 5th year to drop if the initial grant is huge.