Aggregate breakdown dynamics under rainfall compared with aggregate stability measurements

Evolutionary Dynamics with Aggregate Shocks

We study the evolution of the continuous-time replicator dynamics when payoffs are subject to aggregate shocks that take the form of a Wiener process. In the absence of " mutation, " the system need not have an ergodic distribution. With mutation, the system does have an ergodic distribution. In the limit as the mutation rate and the variance of the shocks converge to zero, this distribution co...

Firms and Aggregate Dynamics ∗

We investigate the role of permanent and transitory shocks for firms and aggregate dynamics. We find that permanent shocks to productivity and permanent shifts in the composition of output explain at least 4/5 of firms dynamics. However, these permanent shocks are almost uncorrelated across firms, and are therefore less relevant for aggregate dynamics. Transitory shocks, on the other hand, are ...

Range-Consistent Answers of Aggregate Queries under Aggregate Constraints

Consistent Answers to Boolean Aggregate Queries under Aggregate Constraints

A framework for computing consistent answers to boolean aggregate queries in numerical databases violating a given set of aggregate constraints is introduced. Both aggregate constraints and queries are aggregation expressions consisting of linear inequalities on aggregate-sum functions. In particular, our approach works for a specific but expressive form of aggregation expressions (called stead...

17 Aggregate Stability and Size

An aggregate is a group of primary particles that cohere to each other more strongly than to other surrounding soil particles. Most adjacent particles adhere to some degree. Therefore, disintegration of the soil mass into aggregates requires imposition of a disrupting force. Stability of aggregates is a function of whether the cohesive forces between particles withstand the applied disruptive f...