The meaning and calculation of promotional elasticity of demand

Promotional elasticity of demand measures how sensitive the demand for a product is to changes in the amount spent on promoting it.

Formula for promotional elasticity of demand

$\text{Promotional elasticity of demand}=\frac{\text{\% change in demand for the product}}{\text{\% change in promotional spending}}$

Increased promotion spending nearly always results in increased demand for the product, meaning the promotional elasticity of demand is positive.

Interpreting values of promotional elasticity of demand

The value obtained from the promotional elasticity formula indicates how demand responds to changes in promotional spending.

Types of promotional elasticity values

• Elastic (greater than 1) - Demand is responsive, meaning sales rise by a larger percentage than the increase in promotional spending.
• Inelastic (less than 1) - Demand is not very responsive, so sales grow by a smaller percentage than the spending increase.
• Positive values - Most common, as higher promotional spending typically boosts demand for the product.
• Negative values - Rare, but possible if a campaign offends potential customers, such as through inappropriate slogans or images, leading to a fall in demand despite increased spending.

Worked example - Calculating promotional elasticity of demand

A clothing retailer increases its advertising budget by 20% for two product lines. The basic range sees sales rise by 9%, while the luxury range experiences a 30% increase in sales. Calculate the promotional elasticity for each line.

Step 1: Identify the values for the basic range

• % change in demand = 9%
• % change in promotional spending = 20%

Step 2: Apply the formula for the basic range

$\text{Promotional elasticity of demand}=\frac{9\%}{20\%}=0.45$

Step 3: Identify the values for the luxury range

• % change in demand = 30%
• % change in promotional spending = 20%

Step 4: Apply the formula for the luxury range

$\text{Promotional elasticity of demand}=\frac{30\%}{20\%}=1.5$

Step 5: Interpretation

The basic range has inelastic demand (0.45), so sales grow less than proportionally to spending. The luxury range has elastic demand (1.5), meaning sales increase more than proportionally, making it a better target for extra promotion.

Implications for business decisions on promotional spending

Understanding promotional elasticity helps businesses allocate their marketing budgets more effectively.

Key implications of promotional elasticity

• High elasticity (above 1) - Businesses should consider increasing promotional spending, as demand will rise disproportionately.
• Low elasticity (below 1) - There may be limited benefit to boosting promotional budgets.
• Negative elasticity - Businesses might need to halt or redesign campaigns to avoid damaging sales.
• Strategic allocation - It would generally be more effective for a business to increase spending on products with high promotional elasticity of demand and reduce promotional spending on those with low elasticity.

Factors that influence promotional elasticity of demand

Promotional elasticity can vary based on how well a campaign is executed and targeted.

Influences on promotional elasticity

• Campaign effectiveness - Promotional elasticity depends greatly on the effectiveness of a promotional campaign.
• Target audience suitability - A low promotional elasticity might result from poorly designed promotions that target inappropriate consumer groups.
• Need for investigation - The reason for low promotional elasticity should be investigated before making final decisions about promotional spending allocation.