Berkshire Hathaway Inc. (BRK.B) delivered fourth-quarter 2023 operating earnings of $8.5 billion, which increased 28% year over year. The increase was driven by higher earnings in Insurance-underwriting and Insurance-investment income.Behind the HeadlinesCosts and expenses increased 20.5% year over year to $321.1 billion, largely due to an increase in expenses at Insurance and Other as well as Railroad, Utilities and Energy. Operating earnings from the Railroad business decreased 7.7% year over year to $1.3 ...