Ticket scalping bots Sales of tickets for world-conquering K-pop act BTS's four concerts in Hong Kong were suspended for several hours; due to what is believed to have been an attack by ticket-buying bots-automated computer programs. On promoter Live Nation Hong Kong's Facebook page, BTS fans complained they had spent hours trying to buy tickets since they went on sale at 10 am, and vented their frustration at 'hackers' using software known as bots to flood the ticket-buying system. In a statement posted at 1 pm on its Facebook page, Live Nation said 'unauthorized acts' had led to sales being suspended on the HK Ticketing website, adding that tickets would go back on sale at 3 pm. However, many people were still having trouble accessing HK Ticketing's website after 3 pm. The BTS 'Love Yourself world tour is calling past the AsiaWorld-Expo venue for four nights. Ticket prices range from HK$588 to HK$1, 788 (US$75 to US$228) for reserved seating and HK$1,388 and HK$1,888 for free standing. The VIP package-which includes priority entry and admission to the soundcheck-costs HK$2,488. --> Before official sales resumed at 3 pm, several hundred tickets to the show were being offered on reselling site Viagogo, with HK$588 tickets selling for at least HK$2,245. Prices of the VIP tickets started at HK$11,249. Suspension came one day after Live Nation posted a statement saying no presale or reserved internal tickets had been released for the BTS shows, and warned there was no guarantee that tickets bought from unauthorized resellers and third-party websites were genuine. BTS performed briefly at the Mnet Asian Music Awards (Mama) in Hong Kong, but their upcoming shows will be their first full-scale concerts in Hong Kong since May 2017. The boy band's popularity has exploded since their previous Hong Kong show when they became the firstK-pop band to top the US album charts. Adapted from an article by Adam Wright'BTS concert ticket sales in Hong Kong suspended over"unauthorized

a) Explain the difference between a market surplus and a market shortage.

b) Draw a demand and supply diagram which illustrates a surplus for a global pop star'slive performances.

c) Is thepractice of minimizing the supply of concerts by leading artists one of risk minimization or sales maximization?