Pricing Disney$+$

Disney decided it wanted to provide streaming services directly to customers, rather than renting its library of films and television shows to other streaming services like Netflix. But how successful would a streaming service be$?$ In other words, what did the demand for a "Disney$+"$ streaming service look like? Disney knew that the number of subscribers would depend not just on the attractiveness of the Disney archives, but also on the subscription price. After doing some market research, Disney decided to launch Disney$+$ at a price of $$6\mathrm{.}99$ a month $($or $$69\mathrm{.}99$ per year$).$ When Disney$+$ was launched on November $12,2019,10$ million people signed up on the first day $-$ a resounding success!

Source: News reports, October$-$December $2019.$

Suppose Disney$+$ changes its monthly subscription price from $$7$ to $$9$ per month. Graphically show the impact of this price change in the following markets: