Questions & Answers about El consumidor pidió ayuda.
The accent mark in pidió shows the stress and helps indicate that ió is pronounced properly.
Without getting too technical, the written accent helps mark the correct pronunciation in the third-person singular preterite form:
- pidió = he/she asked for
- pidieron = they asked for
So the accent is a normal spelling feature of this tense form. You should memorize pidió with the accent.