Apparent shortages and multitudes of skills

Apparent shortages and multitudes of skills:

The Programming Wisdom Center^{[self-published source?]} has identified a possible conundrum whereby there may be a skills shortage from the employer's perspective but not the employee's perspective. This can happen when many "sub-skills" are involved in the selection process, such as requirements for multiple programming languages and computer tools often found in technical job ads. The phenomenon may account for seemingly contradictory complaints from both large companies and technical professionals regarding visa worker quotas.^{[4][unreliable source?]}

The theory suggests that the more skills that are involved, the higher the gap between primary matches and secondary matches. Combing the globe for candidates allegedly increases the chances of a better match. However, it may reduce the chance of a citizen being hired even though on the average their skills are on par. In other words, having a wider choice reduces the chances of a citizen being the best candidate due to probability field increase alone rather than lack of skills on the citizen's part.

A comparable analogy would be the opening of Jewelry store B next to the existing Jewelry store A. Even though store A may have similar prices and selection, their sales will still likely slide downward. A given customer will now purchase from the new store B half the time. Unless more customers in total come to the area, store Asales will be cut in half.