Their success has been attributed to their youth; the physical, cultural, and economic infrastructure of Silicon Valley; and the diversity of their skill-sets.[3] PayPal's founders encouraged tight social bonds among its employees, and many of them continued to trust and support one another after leaving PayPal.[3] An intensely competitive environment and a shared struggle to keep the company solvent despite many setbacks also contributed to a strong and lasting camaraderie among former employees.[3][8]