(a) ‘The key to growth – even survival – is to stake out a market position that is less vulnerable to attack from opponents, whether established or new, and less vulnerable to erosion from substitutes...

(a) ‘The key to growth – even survival – is to stake out a market position that is less vulnerable to attack from opponents, whether established or new, and less vulnerable to erosion from substitutes and other competitors.’ What methods can a firm use to establish such a position?

(b) ‘Collusion is difficult to achieve and even more difficult to maintain.’ Explain these difficulties.