The benefits of SUMPRODUCT?

By Victor Alarsa

If you are one of those who loves to model using lots of “IF”, “AND” and “OR” functions, then this article is for you.

Let’s discuss the SUMPRODUCT, which literally means summing up the multiplication (product) of two or more different arrays.

For example, if you want to calculate total rental value of a property with different floor sizes and rents per square foot, then you simply need to multiply each floor size by its corresponding rent and sum up everything in the end.

Continue reading The benefits of SUMPRODUCT?

London: Density vs. Price, Challenges & Opportunities

By Victor Alarsa (
& Maria Wiedner (

We are living in the age of the City. Larger and denser cities are likelier to be more innovative and generate more wealth. For instance, as the population of a city increases by 100%, its residents get 115% more innovative, productive and hence 15% wealthier1. This attracts more people, which, in turn, makes the city larger, denser, more innovative, wealthier. This cycle continues up until a point when pollution, house unaffordability, traffic and crime outweigh the benefits of agglomeration, i.e. when a city becomes too large for its own sake.

Density in general is massively beneficial, for example in 2015, London represented 14% of the UK population but was responsible for 23% of its GDP. However, the virtuous cycle of agglomeration needs to be accompanied by a housing expansion, which many cities struggle with. In London, finding housing accommodation is a challenge; land is scarce and restrictions in planning permission deter new constructions. Demand, on the other hand, is further growing as people want to move to London where jobs are available and the clustering of people has made public goods such as entertainment, health and transport more accessible.

Continue reading London: Density vs. Price, Challenges & Opportunities