#Spain has a low worker productivity compared to many other countries. This means that there is a lack of capital deployed to increase the productivity. Why is that?
To increase worker productivity, there has to be inflation-corrected wage growth, so that companies would be forced to invest capital in productivity, as otherwise there is no profit.
To make #wages grow, there needs to be competition of employees, so that the companies paying too small wages wouldn't get workers, adjusting the market to benefit higher paying companies which are investing in worker #productivity.
To create market competition for employees, there needs to be scarcity of employees, which means unemployment needs to be low. Unemployment is traditionally very high in Spain so this is the root cause for low worker productivity.
How to decrease unemployment then? There are many ways, all vehemently opposed by rent-seeking corporations benefiting from low salaries and betting on low worker productivity growth.
One is to increase the #unemployment benefits actually. This means that workers are less forced to take any job, which means that companies compete to hire from a smaller pool of job seekers. That's also why rentiers always seek to lower unemployment benefits; to increase the pool of job seekers and lower #salaries.