bb
Thank you for bringing this up to our attention. We have evaluated this question and though there are some arguments about currency supply demand being a more technical/economics related concept, it is still falling under the basic principle of supply and demand - the greater the demand, the higher the price. At this time we will keep this question in the active database.
Best Regards
BB
Sneha Jaiswal
Hi Nightfury,
Thanks for the reply. Its quite funny but I have my GMAT in 1 week.
Regarding the question, I wouldnt categorise the 1st statement (
The currency of Country A has been strengthening against other worldwide currencies for the past year, ) as an intermediate conclusion but as a fact or evidence (which cannot be disputed). ICs by the author can be disputed.
I get your point of looking for main subject in the choices but the correct answer choice here says that payment in the same currency creates demand for the currency and hence brings in more currency. This increase in currency in the country is again assumed to strengthen the currency against other currencies. Isnt this possible even if the payment is in any other currency. I am sorry it might be silly but I am quite unaware of all this. Kindly explain.
Thanks for your patience and help in advance.

Sneha Jaiswal After our internal discussions, it was agreed by our team (including myself, on second thoughts) that the law of supply and demand is a basic concept that a business school aspirant is expected to understand.
So, in response to your query, following is the explanation:
If the medium of purchase for country A's goods is the the currency of country A, then more the purchase, more is the currency required in the world market. In other words, more of country A's currency is required in the world market and hence the demand of country A'S currency would be increasing in the world market. As per supply and demand law, higher the demand, higher is the price. So the price of the currency of country A would go high. In other words more currency in other country's terms is required to buy country A's currency - i.e., country A's currency is strengthened.