This unloved and undervalued stock could bounce back over the next two decades.Carnival's (CCL -1.57%) stock hit a record high of $66.19 on Jan. 29, 2018. At the time, the cruise line operator seemed like a stable long-term investment. From fiscal 2007 to fiscal 2017 (which ended in November 2017), its revenue grew at a compound annual growth rate (CAGR) of 3% as its earnings per share (EPS) rose at a CAGR of 2%.Carnival maintained those slow but steady growth rates even as the Great Recession disrupted the ...