Why it is recommended for Project Managers to have PMP certificate?

PMI’s Project Management Professional (PMP)® credential is the most important industry-recognized certification for project managers. Globally recognized and demanded, the PMP® demonstrates that you have the experience, education and competency to lead and direct projects.

This recognition is seen through increased marketability to employers and higher salary; according to the PMI Project Management Salary Survey–Eighth Edition, certification positively impacts project manager salaries

(http://www.bayt.com/en/specialties/s/Project-Management/?utm_medium=&utm_source=jobseekers)

If there's one set of soft skills that has remained high on the IT radar for the past decade or so, to the point where they've become almost as sought-after and every bit as valuable as other top-level credentials, that has to be project management.

Thanks in very large part to the immensely popular and widely pursued Project Management Professional (PMP) certification from the Project Management Institute (PMI), this area has become an incredibly valuable "merit badge" credential for IT professionals of all kinds, because it enhances and expands on the value of just about any other kind of technical credential. (Best Project Management Certifications for2015 - http://www.tomsitpro.com/articles/project-management-certifications,2-670.html)