An analysis of the relationship between income and proteins consumption

the percent change in the price as we move along the demand curve.
If a one-percent drop in the price of a product produces a one-percent increase in
demand for the product, the price elasticity of demand is said to be one. A good with a
price elasticity stronger than negative one is said to be “elastic”, while goods with price
elasticities smaller (closer to zero) than negative one are said to be “inelastic”.
Commodities that are more essential to everyday living, and that have fewer substitutes,
such as staple foods, typically have lower elasticities (Krugman, 2012).
In the economic environment, the cost of food has been identifed as a key factor
affecting demand for various foods (Hawkes, 2010).
 In Andreyeva et al. (2010) 160 studies have been reviewed with this purpose.
Overall, the results of this paper are consistent with economic theory of the demand
response that consider food prices as inelastic. All mean price elasticity estimates were
below 1.0 and ranged from 0.27 to 0.8. Estimates were relatively less inelastic for soft
drinks (0.79), juice (0.76), meats (0.68–0.75), fruit (0.70), and cereals (0.60) and most
inelastic for eggs (0.27), sugars and sweets (0.34), cheese (0.44), and fats and oils (0.48).
Food away from home was most responsive to changes in prices among other categories
(0.81) and more elastic than demand for food at home. As higher estimates suggest
greater changes in purchases as prices change,  foods with higher elasticity estimates are
more subject to respond to public application of tax or subsides. This study suggests that
soft drinks offer a possible target for public health tax policies for  their negative effects
on nutrition. Assuming no substitution of soft drinks with other caloric beverages and no
change in other factors affecting purchasing behaviour, the estimates of the price
elasticity of soft drinks suggest that a 10% tax on soft drinks could lead to an 8% to 10%
reduction in purchases of these beverages.
Other studies have applied economic theories to health-related dietary changes.
In French (2003) two community-based intervention studies are exposed. In these
studies price reductions is used to promote the increased purchase of targeted foods,
because price reduction strategies promote the choice of targeted foods by lowering their
cost relative to alternative food choices. The frst study examined lower prices and point-
of-purchase promotion on sales of lower fat vending machine snacks in 12 work sites
and 12 secondary schools. Price reductions of 10%, 25% and 50% on lower fat snacks
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