本研究最主要之目的在於探討實施價格調整上限管制所可能引發的問題。主要針對多元產品價格調整上限管制以及公平性問題提出改善之方法。並分別以中華電信市內電話以及行動電話作為實證之對象。而價格上限管制方式主要採用拉氏價格調整模式以及平均收益限制模式。並檢視改良後之價格策略以及廠商營收、消費者剩餘以及社會福利的變動情況。以作為管制者以及廠商之參考。本研究之重要結論如下：
在多元產品價格調整上限的改良上，實施改良價格調整上限於市內電
話，由於不同消費族群間的產品銷售組合變動不大的緣故，導致結果與原始價格調整上限管制下之結果相同。對中華電信營收以及社會福利並沒有影響。在公平性的問題方面，實施改良價格調整上限於行動電話，由於公平調整因子過小的緣故，導致結果與原始價格調整上限管制下之結果相差不多。行動電話業者營收下降以及社會福利下降。

關鍵字:市內電話、行動電話、價格調整上限管制

The main purpose of this research is to discuss the problems which may happen when price cap regulation are bring into pratice.
We look for modified methods to the problems of multiple products and fair service. Our research targets are local phone and mobile phone of Chunghwa Telecom company. And We adapt Laspey Price-cap Regulatory and Average Revenue Price Index Regulatory as price cap regulation types. We survey the changes of the pricing strategy and firm’s revenue 、consumer surplus and social welfare. The authority concerned and the firms can take the results as reference materials.
The conclusions are as follows:
In the part of multiple products,we use modified price cap regulation on local phone. The results are the same with the original model. It is because the mix products sale between different consumption group doesn’t change a lot .And it doen’t cause any effect to firm’s revenue and social welfare. In another part of the problem of fair service. we use modified price cap regulation on mobile phone. The results doesn’t change much .Because the fair adjustment factor is too small. Both the firm’s revenue and social welfare go down.

Key words: local phone、mobile phone、price cap regulation

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