Market View: Market reaction of Boris Johnson's resignation, Pinterest, Video game sales, Twitter, SPH REIT, Samsung's rally, Shell $1 Billion gain

With Boris Johnson on his way out, who are potential successors that can replace him and how are markets reacting to such news? Separately, how much are higher profit margins likely to add to Shell's bottom line after a $1 billion gain in its refining business? Michelle Martin and Ryan Huang investigate. 

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