Shares of AGNC Investment (AGNC 2.13%) rallied by 11.2% in December, according to data provided by S&P Global Market Intelligence. Two catalysts propelled the mortgage real estate investment trust (REIT) higher. First, it declared its latest monthly dividend payment, maintaining its double-digit percentage yield. On top of that, the Federal Reserve indicated that it will likely reduce interest rates in 2024, which could benefit the company. Falling rates make the dividend more sustainableWhen AGNC Investmen ...