Cunard is a company that operates large passenger liners providing transatlantic crossings between the US and the UK. Larger cabins, or cabins with balconies are priced higher than the smaller cabins. Also for any cabin, passengers purchasing the voyage in the US pay a much lower price than passengers purchasing the voyage in the UK. Cunard insist that in order to make the purchase in the US the passenger must have a US address. Explain whether these are examples of price discrimination and consider whether price discrimination can be justified.