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#' Complete Berkshire Hathaway Portfolio
#'
#' Data on Apple (AAPL), General Motors (GM), and British American Tobacco (BTI) extracted from Yahoo! Finance (on May 20, 2023) and formatted a \code{firm} objects.
#'
#' @format Three objects of class \code{firm}.
#'
#' @source
#' - Divine, John. “The Complete Berkshire Hathaway Portfolio.” FInancial data. U.S. News & World Report, May 17, 2023. <https://money.usnews.com/investing/stock-market-news/articles/the-complete-berkshire-hathaway-portfolio>.
#' - ICE Data Services. “Nasdaq Stock Exchange & Dow Jones Indexes.” Financial data, May 21, 2023, <https://finance.yahoo.com/lookup/>.
#'
#' @usage data('firms_BKB')
'firms_BKB'
#' Three US firms
#'
#' Data on Apple (AAPL), General Motors (GM), and British American Tobacco (BTI) extracted from Yahoo! Finance (on May 20, 2023) and formatted a \code{firm} objects.
#'
#' @format Three objects of class \code{firm}.
#'
#' @source ICE Data Services. “Nasdaq Stock Exchange & Dow Jones Indexes.” Financial data, May 21, 2023, <https://finance.yahoo.com/lookup/>
#'
#' @usage data('firms_US')
'firms_US'
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