The Biden administration is developing an executive order directing agencies to strengthen oversight of industries that they perceive to be dominated by a small number of companies, a broad-ranging endeavor to rein in large business power across the economy, according to people familiar with the plans.The executive order, which President Biden could sign as soon as next week, would direct regulators of industries from airlines to agriculture to rethink their rule-making process to inject more competition and to give clients, workers, and suppliers more rights to challenge big producers.The goal is to widen the way policymakers approach business concentration in the US going beyond conventional antitrust enforcement focused on blocking large mergers. For example, companies in industries controlled by a small number of large companies might face new rules for disclosing fees to consumers or for their relationships with suppliers.Large business groups and some Republicans will likely protest any new Biden measures. Businesses and conservative legal groups could challenge the rules in court, as they already have with administration moves to limit oil and gas drilling on federal lands and to extend a pandemic-oriented moratorium on evicting renters. Regulatory rivals are hopeful that conservative judges appointed by former President Donald Trump will make it easier to challenge Biden administration rules.