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Ti-84 Programs to Put Into Your Calculator for Microecon

Reviewed by Calculator Editorial Team

This guide provides essential TI-84 programs for microeconomics students. Whether you're calculating supply and demand curves, elasticity, or surplus, these programs will help you analyze market behavior efficiently.

Introduction

The TI-84 calculator is a powerful tool for microeconomics students. With the right programs, you can quickly analyze market behavior, calculate elasticities, and determine consumer and producer surplus. This guide provides step-by-step instructions for programming your TI-84 for common microeconomic calculations.

Before you begin, make sure your calculator is in the correct mode. For most microeconomic calculations, you'll want to use the standard mode with decimal notation.

Supply and Demand Programs

Understanding supply and demand curves is fundamental to microeconomics. Here's how to program your TI-84 to calculate and graph these relationships.

Programming the Demand Curve

To program the demand curve, follow these steps:

  1. Press the [PRGM] key and select [NEW].
  2. Name the program "DEMAND" and press [ENTER].
  3. Enter the following code:
:"Enter price (P):"
Input P
:"Enter quantity demanded (Qd):"
Input Qd
:"Demand equation: Qd = a - bP"
:"Enter a:"
Input a
:"Enter b:"
Input b
:"Demand curve: Qd = " + string(a) + " - " + string(b) + "P"
Pause
ClrDraw
PlotsOn
AxisOn
Line(0, a, 10, a - b*10)
Pause

This program will prompt you to enter a price and quantity demanded, then calculate the demand curve equation and graph it.

Programming the Supply Curve

Similarly, you can program the supply curve:

  1. Press the [PRGM] key and select [NEW].
  2. Name the program "SUPPLY" and press [ENTER].
  3. Enter the following code:
:"Enter price (P):"
Input P
:"Enter quantity supplied (Qs):"
Input Qs
:"Supply equation: Qs = c + dP"
:"Enter c:"
Input c
:"Enter d:"
Input d
:"Supply curve: Qs = " + string(c) + " + " + string(d) + "P"
Pause
ClrDraw
PlotsOn
AxisOn
Line(0, c, 10, c + d*10)
Pause

This program calculates the supply curve equation and graphs it alongside the demand curve for comparison.

Elasticity Calculations

Price elasticity of demand measures how sensitive quantity demanded is to changes in price. Here's how to calculate it on your TI-84.

Programming Price Elasticity of Demand

Follow these steps to create an elasticity calculator:

  1. Press the [PRGM] key and select [NEW].
  2. Name the program "ELASTICITY" and press [ENTER].
  3. Enter the following code:
:"Price Elasticity of Demand"
:"Enter initial price (P1):"
Input P1
:"Enter initial quantity (Q1):"
Input Q1
:"Enter new price (P2):"
Input P2
:"Enter new quantity (Q2):"
Input Q2
:"Price elasticity = % change in Q / % change in P"
:"% change in Q = (Q2 - Q1)/((Q1 + Q2)/2)"
:"% change in P = (P2 - P1)/((P1 + P2)/2)"
E = ((Q2 - Q1)/((Q1 + Q2)/2)) / ((P2 - P1)/((P1 + P2)/2))
:"Elasticity = " + string(E)
Pause

This program calculates the price elasticity of demand based on initial and new price-quantity pairs.

Remember that elasticity values can be interpreted as:

  • Elastic (|E| > 1): Demand is very responsive to price changes
  • Unit elastic (|E| = 1): Demand responds equally to price changes
  • Inelastic (|E| < 1): Demand is not very responsive to price changes

Consumer Surplus

Consumer surplus measures the difference between what consumers are willing to pay and what they actually pay. Here's how to calculate it on your TI-84.

Programming Consumer Surplus

Follow these steps to create a consumer surplus calculator:

  1. Press the [PRGM] key and select [NEW].
  2. Name the program "CSURPLUS" and press [ENTER].
  3. Enter the following code:
:"Consumer Surplus Calculator"
:"Enter equilibrium price (P):"
Input P
:"Enter equilibrium quantity (Q):"
Input Q
:"Enter maximum price consumers are willing to pay (Pmax):"
Input Pmax
:"Consumer surplus = (Pmax - P) * Q / 2"
CS = (Pmax - P) * Q / 2
:"Consumer surplus = " + string(CS)
Pause

This program calculates the area between the demand curve and the price consumers are willing to pay, representing consumer surplus.

Producer Surplus

Producer surplus measures the difference between what producers receive and what they are willing to accept. Here's how to calculate it on your TI-84.

Programming Producer Surplus

Follow these steps to create a producer surplus calculator:

  1. Press the [PRGM] key and select [NEW].
  2. Name the program "PSURPLUS" and press [ENTER].
  3. Enter the following code:
:"Producer Surplus Calculator"
:"Enter equilibrium price (P):"
Input P
:"Enter equilibrium quantity (Q):"
Input Q
:"Enter minimum price producers are willing to accept (Pmin):"
Input Pmin
:"Producer surplus = (P - Pmin) * Q / 2"
PS = (P - Pmin) * Q / 2
:"Producer surplus = " + string(PS)
Pause

This program calculates the area between the supply curve and the price producers are willing to accept, representing producer surplus.

FAQ

How do I transfer these programs to my TI-84?
You can transfer these programs using TI Connect CE software or by typing them directly into your calculator. Make sure your calculator is in the correct mode before programming.
Can I modify these programs for different scenarios?
Yes, you can modify these programs to fit specific scenarios by changing the input variables and equations. The basic structure remains the same.
What if I get an error when running the programs?
Check that you've entered all the required inputs correctly and that your calculator is in the right mode. If you're still having trouble, consult your TI-84 manual or seek help from a professor or tutor.
Are these programs compatible with all TI-84 models?
These programs should work on most TI-84 models, including the TI-84 Plus. However, some older models might have slight differences in syntax or functionality.
How can I clear a program from my calculator?
To delete a program, go to the [PRGM] menu, select [DEL], choose the program you want to delete, and press [ENTER].