Pengaruh Pembatasan Mobilitas, Sentimen, Dan Jumlah Kematian Terhadap Likuiditas Dan Volatilitas Indeks Lq 45: Studi Komparatif Gelombang Pertama Dan Kedua Pandemi Covid-19 = The Impact of Mobility Restrictions, Sentiment, and Deaths on the Liquidity and Volatility of LQ 45 Index: A Comparative Study Between the First and the Second Wave of COVID-19 Pandemic