Economy is like this for example:
e|-------------------------------
B|-------------------------------
G|-------------------------------
D|-------------------------------
A|-------------------2---3---5---
E|-0--1----3---5-----------------
You would start the 0 (open E) with an upstroke, the 1 (F) with a down stroke, the 3 (G) with an upstroke, the 5 (A) with a downstroke, but then, you would continue a downstroke on the next string (2), not an upstroke like alternate picking. Most guitarist use a sweeping type motion going to the next string.
finger_cruncher is dead on with legato.
Sometimes I hit notes only dogs can hear.