Image source: Getty Images The FTSE 100 — the London stock market’s main index — is having a hard time. It’s down 2.7% so far in 2024, as well as losing 3% of its value over one year. However, over five years, the elite index is ahead by 10.6%. By the way, all these figures exclude cash dividends. What’s holding the FTSE 100 back? As I write, the entire index is worth around £2trn. Thus, with 100 companies in it, the mean average market size of a Footsie firm is roughly £20bn...