What is an effect of self-selection of media sources by individuals based on their own ideological biases?

It will increase media bias via or through market competition.

Explanation:

Self - selection is an autonomy that people have to decide on their own. The effect of self-selection are the issues or problems that arrived after, and this is referred to as the self-selection bias.

Ideological bias can be referred to as the collection of ideas possessed by an individual or a group of people.