Show model answer and explanation
11
(10+12)/2.
Class 11 · Bangla Version · Economics
Markets, demand and supply
Compare an initial-base elasticity with a midpoint measure.
Original Kidemy further-topic investigation. This optional lesson is shared by related upper pathways; select suitable depth with a teacher. It does not certify complete grade or board coverage.
Learn the idea
Price elasticity compares proportional quantity change with proportional price change. An initial-base calculation depends on direction; the midpoint method divides each change by the average of its starting and ending values. Neither calculation establishes causation by itself.
Worked example
Price10→12 and quantity100→80 give initial-base elasticity−20%/20%=−1. Midpoint quantity change−20/90 and price change2/11 give−11/9, about −1.22. Both describe this finite comparison with different bases.
- State the endpoints.
- Name each percentage base.
- Separate description from causal inference.
Your written practice
Show your working on paper and enter your answer here. If it does not match, compare the model and try again.
Show model answer and explanation
90
(100+80)/2.
Show model answer and explanation
3
30/10.
Write in your own words. A guardian or teacher should review this response.
Show model answer and explanation
Different percentage bases can produce different finite-change values.
Name the bases, not an unexplained discrepancy.
Write in your own words. A guardian or teacher should review this response.
Show model answer and explanation
Supply shifts or other simultaneous changes may influence both, so the demand relationship is not isolated.
Give a plausible alternative mechanism.
Apply the idea
Calculate both methods for a fictional change and explain each ratio in words.
Review with a guardian or teacher
- Use the stated evidence or givens.
- Show reasoning rather than only a result.
- Review and explain one correction.
Keep your work on paper or in a local file. This page does not upload it or automatically grade the project.
Teacher-led lessons, schedules and prices for this outline are upcoming. You can use any starter practice above now without booking.
Your next step
Solo practice works without an account. Sign in to save a practice record to your learner profile.
Keep practising
Exact lesson links and related activities are labelled separately. Return-to-course links retain your selected learning path.