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秘鲁今天的现实同样提醒我们，制度信任不是通过口号能够建立的，它需要稳定、清晰的权力边界和长期一致的规则。秘鲁的困境正在于此，它不是没有产权，而在没有稳定保护产权的制度。1990年代向前一步，2016年后却步步后退。市场还在，但法治不稳；产权有形，但安全无感。企业家既看不清明天的政府，也看不清明年的政府，更无法判断政策与资产是否安全。在这样的环境下，再完美的产权制度，也可能沦为一纸空文。
Leonardo da Vinci is usually credited with conducting the first systematic study of friction in the late 15th century, a subfield now known as tribology that deals with the dynamics of interacting surfaces in relative motion. Da Vinci's notebooks depict how he pulled rows of blocks using weights and pulleys, an approach that is still used in frictional studies today, as well as examining the friction produced in screw threads, wheels, and axles. The authors of this latest paper used an experimental setup similar to da Vinci's.