On most electronic commerce sites, information about the supply side is digitized and publicly available while information about the demand side is generally not: Amazon, Expedia, iTunes, Etsy etc., all collect and display detailed data about the items for sale, but there is generally little or no information about the consumers with the demands. If we look at the labor market, the reverse us true, in that it is the demand side that's digitized. On online job boards like CareerBuilder, Monster.com, Indeed, SimplyHired etc., vacancies are described via detailed textual descriptions about the nature of the work, skills required, location and approximate salary, but the job seekers---the sellers---generally do not create profiles that describe themselves to the marketplace.
While we might think that there are some fundamental reason for this difference, I don't think this is the case for the simple reason that in the case of labor markets, the supply side is being digitized, primarily though LinkedIn (in a big way) and through sites like oDesk (in a comparatively smaller, but more comprehensive way). On these sites, workers create permanent, searchable profiles for employers that containe rich, employment-relevant data about themselves.
With the rise of LinkedIn, we are witnessing an unprecedented, voluntary data collection and digitization of the supply side of the labor market. On LinkedIn, individuals can create public profiles and list their education, professional credentials, associations, skills, current and past work experiences and, critically, their other professional connections (indicated by approved links to other LinkedIn users). As of yesterday (July 24th, 2012), approximately 19% of the US-based Internet using population had a LinkedIn profile [* see note below for interesting background for this 19% figure]. According to LinkedIn, as of March 12, 2012, over 160 million people have created profiles, and in many industries, a LinkedIn profile is expected of all applicants. I talked recently to oDesk's corporate recruiter, asking her how many candidates had LinkedIn profiles. She responded:
I'd say it is close to 100% (and certainly 100% for viable candidates). I can't think of an example of someone who I have screened who didn't have a profile on LinkedIn.
I think this supply digitization is likely to prove consequential, because once the supply side of the labor market is digitized, platforms can begin making data-driven, highly contextualized recommendations to both sides of the market. The recommendations made by a platform can have the advantage of being potentially informed by the platform's holistic perspective on the marketplace. In computer-mediated marketplaces, by necessity essentially every piece of data that goes into or is generated by the marketplace is captured in an electronic database that could conceivably used to make recommendations.
Of course, job board do try to make recommendations by suggesting vacancies to workers, but they are limited to conditioning those recommendations on whatever search terms and perhaps geographic and/or salary constraints a job-seeker enters in a relatively brief search session. The platform cannot condition its recommendations on a worker's employment history, educational background, skills, current employment status, professional connections, certifications, personality, test scores and other match-relevant factors, nevermind try to balance recommendations to navigate the twin shoals of market thinness and market congestion.
Unfortunately, I think a lot of this work on recommendations will happen within companies in a state of semi-secrecy, but hopefully enough will be made public that others can contribute, ala the Netflix challenge. It's a little sad that to date society has expended more machine learning research effort trying to predict taste in moves rather than fit for jobs, despite the enormous welfare consequences of the labor market. However, I predict this will change and expect a lot more work on this topic from computer scientists and market designers in the coming years.
[*] The Origin of "19% of the US Population has a LinkedIn profile" Number
In writing this blog post, I wanted to get an accurate number for what fraction of the US population has a LinkedIn profile. This number was proving hard to come by, so I decided to try a relatively new service launched by Google called Google Consumer Surveys. For 10 cents an answer, you can pose questions to a supposedly representative sample of US-based Internet users. You also get some of the respondent's basic demographics, such as inferred age, gender and income. I launched a one question survey and got 1511 responses in less than a day. The screenshot below shows the main results, but it also includes some neat tools for looking at the data in different ways. I made the survey public---check it out here. I'm quite pleased with the service and plan to use it again.