Analisis Dampak Perubahan Kebijakan Ekonomi Terhadap Kinerja Perusahaan Sektor Infrastruktur Berdasarkan Perbedaan Karakter di Indonesia dengan Pembanding Singapura, Filipina dan Vietnam = Analysis of the Impact of Changes in Economic Policy on the Performance of Infrastructure Sector Companies Based on Characteristic Differences in Indonesia with Singapore, the Philippines, and Vietnam Comparisons