On the first day of this series, we answer a pivotal question that every investor should ask themselves before embarking on their investment journey: where should you dedicate most of your energy and focus, asset allocation or security selection? We review how the biggest impact to portfolios comes from asset classes rather than individual securities. We also expand on how the largest pools of capital may lack the portfolio agility and mandate flexibility to take full advantage of the excess returns available in the asset allocation arena. This reality tends to generate better and more sustainable long-term opportunities for smaller, unconstrained players to deploy nimble and adaptive investment strategies.

Reference: https://investresolve.com/importance-asset-allocation-vs-security-selection/