Klier and Linn, âNew-vehicle Characteristics and the Cost of the Corporate Average Fuel Economy Standard.â Mark R. Jacobsen, âEvaluating U.S. Fuel Economy Standards in a Model with Producer and Household Heterogeneity,â American Economic Journal: Economic Policy, Vol. 5, No. 2 (May 2013), pp. 1489â87. Ibid., Table 8.
The placebo effect can make some treatments seem like they help certain symptoms, when in fact they do nothing to directly cause a change in the disease. Other factors that are sometimes lumped in with the placebo effect can also make a treatment appear to help even when it does nothing for the illness.n the past, some researchers have questioned whether thereâs convincing proof that the placebo effect is a real effect. But there are studies showing that the placebo effect is real in some situations. For example, scientists have recorded brain activity in response to placebo.
Results indicated that the placebo had little or no effect on skin firmness, while the DMAE-treated skin exhibited greater tautness.9. Researchers offer two possible explanations for these results. First, DMAE may enhance water retention in connective skin tissue, causing the surface of the skin to tighten.