The visualization shows the data for surplus singles in the US. Gender is shown by the color and the size of the circle determines the number of surplus singles. This chart just shows the number of surplus singles, I believe the audience would be confused of how big or large the number is if they do not have an idea about the population of the city. There is no different chart for different age groups to have targeted claims.
This visualization was created to overcome the above disadvantages. The visualization shows the number of surplus singles for every 1000 instead of the actual number, this gives the audience more background of the “how many extra” singles. This gives a nice and clear information to the audience. This visualization also has Slider using which the audience can select the age group they are interested in, this would make the claim to be more targeted.
Usage of map, color and size of the circle is a very easy way for the audience to grasp what the visualization represents. By redesigning the visualization the author has solved the problem the audience had with the original visualization i.e. understand how many more unmatched for 1000 rather than just the entire unmatched singles.