Investment strategy: It depends on the portfolio size

If you want to optimize your investment strategy, there are numerous parameters available. The geographic or sectoral orientation can be adjusted to the general economic conditions and the investment style can also be modified. The portfolio construction also plays an important role. In addition to the question of whether the portfolio weights should be optimized with regard to return or risk characteristics, the question of the "right" portfolio size is also important. But is the number of titles actually decisive for a successful investment strategy?