issue 1) 網上購物,網站標價普遍被視為 invitation to treat
primary source: timothy v simpson, fisher v bell, pharmaceutical society of great Britain v boots cash chemists
secondary source: chitty on contract, vol. 1 31st ed, 2-014, 2-027
issue 2) 標錯價普被視為不構成 offer
primary source: contrast llc v henry boot & sons ltd, goodhart, msmaster university v wilchar construction ltd, ulster bank ltd v lambe, statoil asa louis dreyfus energy service lp, chwee kin keong v digilandmall. com ptd ltd
secondly source: chitty on contract, 5-075 5-076, Cartwright, misrepresentation, mistake and non-disclosure, 3rd ed, paras 13-24-13-26