What are the key issues facing McDonald's in 2026?The stock market has been volatile this year, including a swoon in March and April after the Trump administration announced tariffs. However, equities have bounced back, with the S&P 500 (^GSPC 1.16%) up 16.1% through Dec. 12.Turning to individual stocks, it's a good time to review how they've done and what to look for in 2026. Turning to ubiquitous fast-food chain McDonald's (MCD +1.33%), it has been an eventful year.It's time to take a look back at how McD ...