Japan's antitrust watchdog searched Rakuten Inc.'s head office building in Tokyo on Monday over the internet mall operator's plan to make marketplace tenants shoulder the cost of its proposed free shipping service.A Rakuten official confirmed the search had taken place and said the company will fully cooperate with the probe.The Japan Fair Trade Commission launched an investigation last month on suspicion the e-commerce giant is breaching the antimonopoly law by abusing the company's dominant position against smaller online retailers that depend on its platform, the sources said.The probe c…READ FULL ARTICLE