問題係shortage本來就imply non price
而Price competition 係視乎情況
未到equilibrium之前就會有non price competition當demand升或者supply跌,去新equilibrium既原因,係因為有shortage wor如果shortage有可能出現price competition, 又有可能出現non price compeetition,問題係shortage本來就imply non price
咁有shortage,咪唔一定imply price或者non price competition囉
而Price competition 係視乎情況
忽然落大雨,對遮嘅需求大增,呢個時候邊個快手就邊個買到,呢個已經係non price competition