Four lines, two sentences, and a whole change of life. "Economy" announces its subject in its first clause: there was a time of "a lot of theories," and now there is none. What replaced them is not another philosophy but something almost insultingly simple, a rule of minimal effort and minimal cost. The speaker does whatever "the least me wearies / that costs the smallest penny." Where there was once a head full of systems, there is now a person quietly choosing the easiest, cheapest path.
The poem's central idea is a kind of comic retreat from ambition. Theories are what we build to explain the world and to justify how we ought to live in it; to have "a lot" of them suggests youth, appetite, perhaps a certain intellectual vanity. To have "none" could be read as wisdom, as exhaustion, or as defeat, and the poem never tells us which. That ambiguity is its charm. The speaker sounds neither bitter nor triumphant. The tone is dry, even breezy, as if reporting a sensible household adjustment rather than the collapse of a worldview.
The title does a lot of work here. "Economy" means thrift, and the second couplet is literally about money: the "smallest penny." But the word also covers economy of effort, economy of thought, even the economy of the poem itself, which spends only twenty-odd words. The speaker has applied the same principle to living and to writing. The form enacts the philosophy: a poem about doing the least necessary is itself as short as it can reasonably be.
The construction is lightly but neatly managed. The rhymes fall on "theories" and "wearies" in the first and third lines, and on "any" and "penny" in the second and fourth, an alternating scheme. The rhymes are feminine, meaning they end on an unstressed syllable, and that gives the poem a bouncy, slightly sing-song lilt, close to nursery verse or light comic poetry. This matters, because the content is faintly melancholy and the sound is playful. The gap between the two is where the wit lives. A speaker who has abandoned all her theories can still, apparently, find a rhyme for them.
The word choices reward a closer look. "Theories" is a grand, abstract, slightly pompous word, and the poem lets it rhyme with "wearies," a tired and domestic one, so that the lofty thing is undercut by the very sound that follows it. The pairing quietly suggests that theorizing is exhausting, that the cost of all those systems was fatigue. Then there is the odd phrasing of "the least me wearies." The speaker does not say "whatever tires me least" but makes herself the grammatical object of weariness, "me" planted awkwardly and honestly in the middle of the line. The self here is something that gets worn down, and the new policy is a way of protecting it. Notice too that the poem has no imagery in the usual sense, no landscape, no objects beyond that single penny. The absence suits the subject: a mind that has stopped decorating its life with ideas does not reach for pictures either.
The contrast between "a lot" and "any" gives the first couplet its shape, abundance swinging to nothing in the space of a line break. The second couplet then replaces abundance with arithmetic, "least" and "smallest," two superlatives pointing downward. Everything in the poem moves toward less, and the final word, "penny," is about as small as a word can be, ending the poem on the lowest coin available.
What makes the poem significant is how much it gets from so little. It captures a mood many readers will recognize, the moment when grand explanations stop seeming worth the trouble and a modest practicality takes over, and it does so without lecturing. Whether that is liberation or surrender is left for us to decide, and a short poem that can hold both possibilities at once has spent its small change very well.