Here's why investors should consider putting money in the market now as optimism climbs, according to Vanguard's head of investor research

• Investors should consider moving cash into the market right now, according to Vanguard's global head of investor research and policy.
• Retail investors are trading less, which suggests a "stay the course" stance and more upbeat economic outlook, Fiona Greig explained. 
• In her view, investors can capitalize on the current landscape by increasing their savings rate and leaning more into employer-sponsored retirement accounts.

Investors are increasingly holding their positions in the market despite volatility, and that points to optimism for the broader economic outlook, according to Vanguard's global head of investor research and policy, Fiona Greig.