b$.$ Given that Twitter is listed on the NYSE, do your total transaction costs for December seem reasonable? Explain why or why not

Twitter is listed on the NYSE, a broker market. So$,$ had Charles Schwab routed the onder to the NYSE, it could have been execuled against a buy order, and total transaction costs would have been only the $$25$ brokerage commission. But transaction costs included half the bidlask spread per share lraded, so sither $($i$)$ the order went to the NySE, no public buy order was available, and the market maker bought the $1,600$ shares for her invertory $($at a cost of hall the bidlask spread per share$)$ or $($i$)$ Charles Schwab routed the order to a dealer market like NASDAQ, and a market maker added the shares to her imventory $($at hall the spread per share$)*$

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