There are a growing number of people working in this field, many of whom have slightly different definitions. We start by considering investments through a number of gender frames or 'lenses'.

Women effect investors are women, men and institutions. Some are women effect investors without realising it. This is a new field, and it's evolving.

Looking at a portfolio through these lenses may not mean we have to ‘move’ money from one asset to another or from one investment to another. It might mean keeping everything in place and just asking new questions, seeing patterns and valuing women in all parts of the value chain.

Investing in women and girls is not about negatively affecting men and boys or leaving them out. However, gender inequality has been ignored for so long that there is value in overemphasising this now.

One key frame lies in the fact that women have less access to capital around the globe. This is true in emerging markets in the global south and it’s true in tech start-ups in Silicon Valley. The scale, shape and consequences of the problem are different, of course, but the fundamental issue is exactly the same.