The doctrine of legislative supremacy is well suited to a centralised, unitary system of government in which the needs of the executive are closely linked with the dominant political voice in parliament: and in which the judiciary exercise an important but subordinate role. Dicey suggested that political sovereignty, as opposed to legislative sovereignty, lay in the electorate and that ultimately the will of the electorate would prevail on all subjects to be determined by a government (although he was referring to Britain)
The electoral system serves as a limitation on the use of legislative powers, but the control which it provides is very generalised and sporadic in effect: and this effect depends in turn on the political parties, on the media, on economic and social interest groups, and on other means by which public opinion is formed and expressed.
I think the argument for parliamentary sovereignty is strengthened if it can be shown that the political system in question provides adequate safeguards against legislation which would be contrary to fundamental constitutional principle or the individual's basic rights. It is, however doubtful that the present system in the UK which relies so heavily on political controls, adequately protects individuals or minority groups who may be vulnerable to legislative oppression. Moreover under parliamentary sovereignty, parliament's importance within government depends less on absolute legislative power than on its effectiveness as a political forum in expressing public opinion and in exercising control over government.