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What Warren Buffett has been investing in amid the pandemicWarren Buffet spent a record $5.1 billion buying back shares of his Berkshire Hathaway Inc. in the second quarter.Bloomberg, BloombergThe “Oracle of Omaha” doesn’t like retirees’ chances – at least those on fixed-income investments.”Fixed-income investors worldwide – whether pension funds, insurance companies or retirees – face a bleak future,” Warren Buffett said in his annual letter to Berkshire Hathaway investors, a document many look to for investment tips and guidance on the future of the economy.That’s in part because the bond market is ailing as the economy gains momentum despite the COVID-19 pandemic. Buffett noted that in certain foreign countries, including Germany and Japan, fixed-income investors are earning a negative return on sovereign debt investments.Berkshire Hathaway’s Warren Buffett: ‘Never bet against America’Warren Buffett’s pandemic investments: Apple is Berkshire Hathaway’s biggest equity investmentThe implication is that stocks may be the best mechanism to grow your retirement portfolio. Berkshire’s portfolio ranges widely from Geico to Apple to General Motors to Coca-Cola. The Omaha, Nebraska-based Berkshire chairman, who earned the nickname “Oracle of Omaha” for his successful stock picks, also defended his recent strategy of repurchasing Berkshire shares. He said the plan would build value for existing Berkshire stockholders by limiting the pool of outstanding shares and thus increasing their proportional investment in the company.Also in his letter, Buffett said he remains confident in the future of the country because “despite some severe interruptions, our country’s economic progress has been breathtaking.””Beyond that, we retain our constitutional aspiration of becoming ‘a more perfect union,'” Buffett wrote. “Progress on that front has been slow, uneven and often discouraging. We have, however, moved forward and will continue to do so. Our unwavering conclusion: Never bet against America.”Follow USA TODAY reporter Nathan Bomey on Twitter @NathanBomey.