Can you suggest a test for the hypothesis that dating apps are driving changes? What percentage of marriage do you expect at age 30, and how do you account for

Can you suggest a test for the hypothesis that dating apps are driving changes? What percentage of marriage do you expect at age 30, and how do you account for the negative economic circumstances following the crisis of 2008, which must have pushed the marriage rate down somewhat for those who are currently 30? I think we all understand that social systems are multi-variate and so it is difficult to assert absolutes. But you must have in mind some statistics that you expect to see in the evidence, and if you don't see them you'll agree that the theory is probably disproven? I've previously emphasized economics over dating apps. Following the theory that males wages, relative to rent/mortgage, have a big impact on the formation of heterosexual couples, please see what I wrote in "Do men become warlike if they do not have women?" http://www.smashcompany.com/philosophy/do-men-become-warlike-if-they-do-not-have-women http://www.smashcompany.com/philosophy/do-men-become-warlike...