A bad penny always turns up.

烂钱总是会再回笼。

youdao

I don't want you to associate with Jason; he's a real bad penny.

我不想让你和贾森交往，他的品质真坏。

youdao

Bill seldom goes to our pub these days yet he always turns up like a bad penny when there is free food on darts night.

比尔最近很少来我们的酒店，然而晚上的掷镖游戏上有免费食品供应时，他总是会来的。

youdao

Players choose one of five characters representing the five year-round Big Boss brews: Hell's Belle, Bad Penny, Angry Angel, Blanco Diablo and High Roller.

ENGADGET: Beercade replaces arcade coin slots with beer taps, rewards winners with brew

"It's becoming a national movement, " says Penny Jones-Napier, owner of the Big Bad Woof pet store in Hyattsville, Maryland, the first business in the US to adopt the new benefit corporation designation.

BBC: US firms put social values before big profits

So paying penny-scale commissions and suffering penny-scale market impacts may not be all that bad.

FORBES: Why 'Dumb Money' Like Buffett Aren't Getting Hurt By High-Frequency Trading