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# find - Thomas Piketty - Ens

find - Thomas Piketty - Ens

## 7. Applications to

38 lifetime resources is larger than the capital share in national income if and only if the inheritance flow is larger than the capital share. In theory, both cases can happen: there can be societies where the capital share is large but the inheritance share is low (say, because most wealth comes from lifecycle accumulation), and conversely there can be societies where the inheritance is large but where the capital share is low (say, because capital serves mostly as storage of value and produces little flow returns). It is interesting to see that in practice the inheritance share αˆ and the capital share α happen to have the same order of magnitude (typically around 20%-30%) – mostly by coincidence, as far as we can see. Proposition 5 is pure accounting, and it holds for any saving model, both in and out of steady-state. If we now apply Proposition 5 to the steady-state models analyzed in section 5, then we just need to replace b yt by the relevant steady-state value. So for instance in the class saving/dynastic model, we have b y =β/H, so that: αˆ = b y b y = + λ(1 − α) β β + λ(1 − α)H (7.3) Example. With benchmark values β=600%, H=30, 1-α=70%, λ=1, we have b y =20%, and αˆ =b y /(b y +1-α)=22%. That is, in steady-state each cohort derives αˆ =22% of its lifetime resources through inheritance, and 1- αˆ =78% through labor. To put it differently, inheritance resources represents ψ=b y /(1-α)=29% of their labor resources. We used our full fledged simulated model (based upon observed demographic data and age profiles of labor income and inheritance receipts) in order to compute the capitalized value of x lifetime resources y~ = x b ~ + y~ x L for all French cohorts born between x=1800 and x=2030. We find that the inheritance-labor resources ratio ψ x = b ~ x / y~ was about 30% for 19 th century cohorts, then dropped to little more than 10% for cohorts born in the 1900s-1930s, and is projected to be again about 30% for cohorts born in the 1970s-2030s (see Figure 11). 70 x L As predicted by the theoretical model (Proposition 5), the historical evolution of the cohortlevel inheritance-labor income ratio ψ x (Figure 11) is the mirror image of the pattern found for the cross-sectional inheritance flow-national income ratio b yt (Figure 9). There are two interesting differences, however. First, the U-shaped pattern is less marked for ψ x than for b yt . At its lowest point, i.e. in the 1950s, the inheritance flow b yt was less than 5% of national income. In comparison, the lowest point of ψ x , which was attained for cohorts born in the 1900s-1930s, is somewhat above 10%. This is because all members of a given cohort do not inherit exactly at the same time. E.g. cohorts born in the 1900s-1930s inherited everywhere between the 1940s and 1970s. So when we compute cohort level averages of inheritance resources, we tend to smooth cross-sectional evolutions of the inheritance flow-national income ratio. The cohort level pattern is nevertheless quite spectacular. As compared to earlier and later cohorts, individuals born in the 1900s-1930s (and to a lesser extent those 70 E.g. we find that cohorts born in the 1970s will on average receive 440,000€ in inheritance and 1.58 millions € in labor resources, so that ψ=28%. See Appendix D, Table D7. We capitalize resources at age 50, but of course this does not affect the ratios, since we use the same age and rates of return for inheritance and labor income.

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