https://www.youtube.com/watch?v=6KJhicTFegI
https://www.youtube.com/watch?v=bp4vUR1s9fY&index=93&list=PLqnZG9SrAmIH9WX01EM0P5wVJ9D3Dp7Ec&t=160s
https://www.youtube.com/watch?v=Vpap-PvlBfo&index=83&list=PLqnZG9SrAmIH9WX01EM0P5wVJ9D3Dp7Ec&t=1s
https://www.youtube.com/watch?v=03TIl_cNVUc&index=86&list=PLqnZG9SrAmIH9WX01EM0P5wVJ9D3Dp7Ec&t=0stelling min sales is a bad idea. There's some tricky people who can use this to estimate outbidding them