Trial is a mass of expenses starting with jury fees, expert depositions, expert trial payments, etc.. (lajewishlawyer.com)
The jury's role is always the same - show up, be selected and sworn in, listen to the opening and closing arguments and the evidence that the judge admits under the rules of evidence, listen to the jury instructions from the judge, deliberate and render a verdict based upon that deliberation in a manner set forth on a jury verdict form that the jury is provided with by the judge, they do this for sub-minimum wage jury fees, a few free meals, and maybe a parking or transit voucher. (law.stackexchange.com)