Consider the Hong Kong Exchange. Above shows the market information of HSI futures at some point in time. Each HSI futures contract has a market value of $$0$ and a notional value of $$1123700.$ Suppose there are three traders, A$,$ B$,$ and C$.$ Over one day, the following trades occur:

A long, B short, $7$ contracts.

A long, C short, $10$ contract.

B long, C short, $12$ contracts.

C long, A short, $16$ contracts.

a$.$ What is the trader$$s net position in the contract at the end of the day? $($Calculate long positions minus short positions.$)$

Trader A:

Trader B:

Trader C:

b$.$ After the time of quote, there are only trades between A$,$ B$,$ and C$.$ What are the

$($i$)$ trading volume measured by the number of contracts

$($ii$)$ Open Interest measured by the number of contracts

$($iii$)$ Trading volume measured by the notional value

$($iv$)$ Open Interest measured by the notional value

for these A$-$B$-$C transactions? $($Hin

c$.$ After the A$-$B$-$C trades, what are the updated trading volume, open interest, and the notional values of trading volume and open interest on the day in the market, assuming that traders A$,$ B$,$ and C had no position before the trades?

Updated trading volume $($number of contracts$)$ in the market:

Updated open interest $($number of contracts$)$ in the market:

Updated notional values value of open interest in the market:

d$.$ You found that you have made a mistake. Originally you thought these were the trades of HSI futures, however, it turns out to be the mini$-$HSI futures. Hence, how would you expect the measures in part $($b$)$ to be different?

Hint: You may need to check the contract specification of the HSI futures and mini$-$HSI futures to answer this question, specifically, check the contract multiplier $($contract multiplier has a similar meaning as the contract size$).$

Trading Volume $($number of contracts$)$ for the A$-$B$-$C transactions:

Open interest $($number of contracts$)$ for the A$-$B$-$C transactions:

Notional value of trading volume for the A$-$B$-$C transactions:

Notional value of open interest for the A$-$B$-$C transactions: