Analisis Pengaruh Merger dan Akuisisi Terhadap Kinerja Perusahaan Jangka Pendek pada Perusahaan Tercatat di Bursa Efek Indonesia yang Melakukan Transaksi Merger dan Akuisisi Periode 2013-2021 = Analysis of the Impact of Mergers and Acquisitions on Short-Term Company Performance of Listed Companies on the Indonesia Stock Exchange that Undertook Mergers and Acquisitions in the 2013-2021 Period