who is the richest person in canada 2018?
['David Thompson. Worth: $25 billion. ... ', 'Joseph Tsai. Worth: $9.7 billion. ... ', 'James Irving. Worth: $8.3 billion. ... ', 'Jim Pattison. Worth: $6.9 billion. ... ', 'David Cheriton. Worth: $6 billion. ... ', 'Garrett Camp. Worth: $4.8 billion. ... ', 'Mark Scheinberg. Worth: $4.8 billion.']