Short Term Trading Week Starting: 8th Aug, page-184

Importance of volume and price movement ....

You need think of volume in terms of "power" and price movement as speed or velocity... think of a car travelling uphill against gravity and the volume being the amount of pressure needed on the accelerator peddle needed to get over a hill. Too little accelerator pressure and the car will come to a halt or may even roll backwards some... Sustained pressure is required to crest the hill ( "the hill" being synonymous with key resistance points).

So once at top of hill (ie, a breakthrough of a resistance area has been achieved) and assuming no let up in volume/power (continued accelerator pressure) then this leads to a sharp increase in velocity/speed (or quick spike in price) ... until the next hill/resistance area is reached.