We are first introduced to Narcisse’s son, Lord Edward in 2x01, who asks the Queens to confine one of his rivals into plague quarantine, ensuring his infection and subsequent death.
Queen Mary: “You come here and blatantly request that we murder your foe?!”
Lord Edward: “If it were a request, I wouldn’t be so blatant. It’s more of a demand.”
Queen Catherine doesn’t blink an eye, asking for the blackmail details. He claims that the man is bedding his new wife, and that he wants vengeance without risking reprisals. (“Food for survival in exchange for one life, easily taken.”). Mary, new to the politics of ruling, is absolutely outraged, but Catherine spells it out for her:
“We have order, food, and money because [the nobles] grant it to us. And in exchange we-- grant them certain privileges.”
Catherine strongly advises bowing to his demands, an exercise in simple math, but Mary stubbornly refuses and Lord Edward has his rival’s family poisoned instead. Incensed, Mary subjects him to the same fate he had originally wanted for his rival in an exercise of Screw the Money, I have Rules. As he is dragged away, he spouts disbelief of her ignorance (and his actually suffering consequences for openly admitting to mass murder!) and ominous threats.
Lord Narcisse continues to play the trope cynically straight when he continues to torment them until mid-season, showing how his wealth is equal to their power by refusing to bow to the king or queen’s commands, reminding the Crown of its debts to him and withholding grain during famine, and getting away with murders, stolen lands, embezzling and blackmail because of it.
Queen Catherine: “You want to teach my son a lesson. About who holds the power in France.”
Lord Narcisse: “Time will teach Francis to think like his father.” (2x02)
Naturally in such a villain’s role, the trope is inverted plenty of times: Francis and Mary thwart Narcisse’s schemes over and over and eventually Francis gains the leverage to strip Narcisse of his wealth and lands and thereby most of his power mid-season. (Though notably, not all of it.)
Reign also shows a rather more deft application of this trope through the actions of Queen Catherine de Medici, who sends grain and rebuilds steeples and wells in her name to ensure that the commoners remain grateful and aware of her generosity. “I don’t care about peasants individually, but in general I care a great deal. And so should you. … There are 20 million of them and one small family of royals. To survive we must have their love. Thank heavens I can buy it!”(2x06)
It’s different from the overt way Narcisse parlays his wealth into power plays, but also very effective, and he openly admires her when he figures out her strategy.
Still, Catherine de Medici is the exception to the rule when it comes to women with money: it’s been shown throughout both seasons how powerless most noblewomen are because they have no access to their own money, even their dowries. A husband or father always holds the purse strings, which cripples women in times of crisis.
Lady Kenna: “Lola, we’re women. We’re not allowed to have things of our own. Legally, Bash even owns my corsets and lip rouge.”(2x06)
And yet a couple of the girls have made their own journeys to financial independence over the season, first Lola securing the use of her own dowry (and financial independence), then Lady Greer taking up the unsavory occupation of Madam to escape poverty after her husband is thrown into prison, rendering her destitute.
Lady Greer: “I want what I have. A man I love, not a man I have to depend on.”(2x17)
“It’s not the ideal vocation, I admit. But it pays well and I’m in charge of my own life, for the very first time.” (2x19)