There Is a 30% Chance That Any Current Client of Company

Short Answer

There is a 30% chance that any current client of company A will switch to company B this year.There is a 20% chance that any client of company B will switch to company A this year.If these probabilities are stable over the years, and if company A has 1000 clients and company B has 1000 clients, in the long run (assuming the probabilities do not change), what will the market shares be?