This is a crucial area. If you do not have schema markup and rel="author", you are costing your business money. It is as simple as that. As an example, say I want to make spaghetti (pasta) for dinner I search for “Spaghetti Recipe” and instantly I see some great markup in play, but one competitor has no markup and no rel="author" they are losing business in my eyes. Wouldn't you agree?.
There are also a few more similarities. All of these marketing methods are measurable to an extent never seen in any other media. Every click can be measured – where and when it came – and followed through to the conversion, the sale and the lifetime customer value.  This feedback loop creates optimization opportunities that can create huge incremental improvements in your SEM campaigns.
At the retail level, the two top organic food sales categories, receive significant price premiums over conventionally grown products. ERS also analyzed organic prices for 18 fruits and 19 vegetables using 2005 data on produce purchases, and found that the organic premium as a share of the corresponding conventional price was less than 30 percent for over two-thirds of the items. The premium for only one item—blueberries—exceeded 100 percent. In contrast, in 2006, organic price premiums for a half-gallon container of milk ranged from 60 percent for private-label organic milk above branded conventional milk to 109 percent for branded organic milk above private-label conventional milk. See the ERS report for more on this topic:
Remember when you used to rely solely on search engines for traffic? Remember when you worked on SEO and lived and died by your placement in Google? Were you #1? Assured success. Well, okay, maybe not assured. Success only came if the keywords were relevant to your site users, but it was the only real roadmap to generating site traffic and revenue.