Many decades have passed since then, and nowadays Spain is of course a fully developed democracy, but the remains of that society still exist. It is present for example in the value given to stable jobs by the low-middle class, where people basically assume a glass ceiling - "why take risks changing jobs or try to start a business? You don't have the contacts nor the money anyway".
The lack of people with technical backgrounds in the upper class is also very evident: In the US you'll find many engineers that later went for an MBA and moved into leadership positions, and many companies have engineers as founders. Here, business administration is a career, not a masters degree, and for people who graduate in such programs, it is assumed that they already have the money or the connections to start their careers already in a leadership position - they practically choose "boss" as their job description, so to speak.