I find this quite unreasonable for two important reasons:
- Apple's revenue is based on a portfolio of products that become obsolete after two years (at most). Because of this, Apple is dependent on constantly rolling out new products - and thus on the hit-or-miss nature of consumer tastes. Google serves as the gatekeeper to the Internet. Although their market share can be chipped away, Google could never lose 10 to 20% of its revenue over a few months - something that could easily happen to Apple if the next iPhone is a flop.
- Google's revenue comes from a more diversified source of business customers. Google still earns the majority of its income from the advertising-network associated with its main search engine. The customers that pay to display these ads come from nearly all corners of the economy - thus likely mimic the overall economy. Apple targets a fickle, high-end customer-base that is rarely predictable.
Google is the cruise ship while Apple is the speed boat. Google is strong and large. Apple is fast and unstable.