What is the difference between bill of quantities pricing and traditional "quota" pricing?

(1) The biggest difference between bill of quantities pricing and quota pricing is that it reflects the different pricing stages of the development of China's construction market? The quota pricing model reflects the stage of state price or national guidance price;

Does the bill of quantities pricing model reflect the market pricing stage?

(2) What is the valuation basis of bill of quantities and quota valuation? Different in nature and project division? What is the main basis of bill of quantities valuation? Code for valuation of bill of quantities of construction projects? (GB50500—20 13)