1. The problem asks for the fraction of traders who sell only one commodity. 2. To solve this, we need to know the total number of traders and how many of them sell exactly one commodity. 3. The fraction is calculated by dividing the number of traders selling only one commodity by the total number of traders. 4. Formula: $$\text{Fraction} = \frac{\text{Number of traders selling only one commodity}}{\text{Total number of traders}}$$ 5. Without specific numbers, we cannot compute a numerical answer, but this formula and explanation guide how to find the fraction once data is available.