The Omaha, Nebraska-based conglomerate purchased roughly 2.3 million shares for about $54 million in separate transactions Thursday through Monday.

Berkshire Hathaway has compounded shareholder capital at nearly 20% annually since the 1960s. It all comes down to capital allocation, something the great Warren Buffett, longtime CEO of Berkshire, is great at.

When I saw the big Walmart announcement about Canada last week, I thought immediately of what Warren Buffett famously said in his 1986 Berkshire Hathaway shareholder letter: “Our goal is more modest: We simply attempt to be fearful when others are greedy and to be greedy only when others are fearful.