I love the focus on the global versus local it's an important distinction that many engineering leaders don't see sometimes and but at the global level this is something that we've talked about again on this podcast a couple of times. Every team may have different optimization functions some team may be really good in execution but may not have customer empathy or connected to customers. Some teams may have lots of debt that they have to remove before they can move faster so there are different optimization functions for each of the teams. There's no one metric that you can optimize and actually create an amazing culture like Jason said it's a neural let's say optimization on multiple dimensions and it depends on the company.