The simplest case where this principle can be observed is discussed in detail. To achieve this, we study the asymptotic properties of the variable \[ Z_d:=\frac{X_1}{d}\big{|}\{X_1+X_2=d\}, \] as $d\to \infty$. Here $X_1$ and $X_2$ are non-negative i.i.d. variables with a common twice differentiable density function $f$.
General results concerning the distributional limits of $Z_d$ are discussed with some examples. Eventual log-convexity or log-concavity of $f$ turns out to be the key ingredient that determines how the variable $Z_d$ behaves. As a consequence, two surprising discoveries are presented: Firstly, it is noted that the distributional limit is not strictly determined by the decay rate of the tail function.
Secondly, it is shown that there exists a light-tailed distribution exhibiting behaviour that is commonly associated with heavy-tailed distributions i.e. the principle of a single big jump.