  Let r be an orbit of the quiver representation of type A_n (equioriented
case). In this paper we study the Poincare dual of the closure of r (a.c.a.
Thom polynomial/degeneracy loci formula) in equivariant cohomology. Using
general Thom polynomial theory we prove the component formula and its stable
version of [Knutson-Miller-Shimozono] as well as the positivity of the quiver
coefficients of [Buch-Fulton]. We also show how the component formula follows
from Grobner degeneration easily. In relation with the K-theory counterpart of
the formula we give a new description of KMS factorizations based on
transformations of lace diagrams.
