Which of the following factors are not relevant for judging the adequacy of market?

Labour market indirectly affect market adequacy by influencing production capabilities, an hence are useful in judging how adequate is the market. 

Domestic and export demand are similarly useful in giving an idea of how big the market is. 

While competitors and their market shares provide insight into the competitive landscape, they do not directly determine the adequacy of the market itself. Hence is not a relevant factor. 

Therefore, Option D is the correct answer.