wgt
WGT (Weighted average) is a way of measuring something that gives more importance to the bigger or more common parts instead of treating everything as equal.
In plain English
Here is the surprising part. If you and your oga both earn different salaries and the bank wants to know the average interest rate on your combined savings, it would be lazy and wrong to just add the two rates and divide by two. The person with more money in the account should pull the average closer to their own rate. That is the whole secret behind WGT, short for weighted average. It gives more voice to whoever has more at stake.
In Nigeria, you meet this calmly in inflation numbers. The National Bureau of Statistics does not treat garri and generator fuel as equally important in the average Nigerian's basket. Garri gets a heavier weight than say, imported wine, because more households spend more of their money on garri. So when you hear that inflation rose by a certain percentage, that figure is a weighted average, built to reflect real spending patterns rather than a flat, everybody counts the same calculation.
Someone in Lagos sending contributions into a cooperative society, called ajo or esusu in some circles, will see this in a smaller way too. If members contribute different amounts, the interest or dividend shared out is often worked out as a weighted average based on how much each person put in, more than splitting it evenly by headcount.
A UK example makes it click as well. When the Bank of England talks about the average interest rate households pay on mortgages, it is not treating a person with a small ₦2 million equivalent mortgage the same as someone with a ₦40 million equivalent one. The bigger loan pulls the average more, because it represents more of the total money at play.
WGT matters in macroeconomics because national statistics, from inflation to GDP components to exchange rate baskets, are almost never simple averages. They are weighted, and knowing that changes how you read the news.
If ₦70,000 is spent on food and ₦30,000 on transport in a household budget, and food prices rose by 20% while transport rose by 5%, the weighted average inflation for that household is (0.7 x 20%) plus (0.3 x 5%), which comes to 15.5%, not the plain average of 12.5%.
Questions people ask
Why more than use a simple average instead of WGT?
A simple average treats every item or person as equally important, which can badly mislead you when some items or amounts are far bigger than others. A weighted average corrects that by giving bigger shares more influence on the final number.
Where will I actually see WGT used in everyday Nigerian finance?
You will see it in inflation reports, in cooperative society dividend calculations, in mutual fund returns, and in interest rates on loan portfolios where different loan sizes are blended into one overall figure.
Does a higher weight always mean a better outcome for that item?
Not necessarily. A higher weight simply means that item has more influence on the average, whether the outcome for it is good or bad. Garri having a heavy weight in inflation calculations just means changes in its price move the overall figure more strongly.
Last reviewed