#' Input-output table for U.S. economy
#'
#' Based on data from TODO
#'
#'
#'
#' @docType data
#' @name Input_output
#'
#' @format
#' 22-by-22 numeric matrix with dimnames.
#'
#' @source
#' TODO
#'
#' @references
#'
#' TODO: Bojanowski () "Industrial structure and interfirm collaboration".
NULL
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