In recent developments, former U.S. Treasury Secretary Janet Yellen engaged in a profound conversation with CNBC regarding a host of issues, primarily focusing on the recent slump in U.S. Treasury prices, soaring yields, and the pressing concern of fiscal deficits. Her insights not only provided a comprehensive analysis of the economic landscape, but also illuminated the intricate ballet between fiscal policy and market dynamics.

Yellen articulated that the unexpectedly resilient economic indicators served as a catalyst for the recent sell-off in U.S. Treasury bonds. These indicators have incited a reevaluation of the market's interest rate expectations. The rise in key economic metrics has signaled to investors that the trajectory of future interest rates may be steeper than previously anticipated. For instance, by midweek, the yield on the benchmark ten-year Treasury note peaked at approximately 4.73%, marking its highest point since the previous April. This shift in data further validated Yellen’s assertions about changing market sentiments, as investors recalibrated their outlook on government debt accordingly.

Moreover, Yellen elaborated on the evolving dynamics of term premium—the additional return investors expect for choosing long-term bonds over the routine strategy of rolling over short-term ones. Historically, this premium has languished at low levels; however, amidst the recent positive economic trends, confidence among investors has surged. They now seem more inclined to venture into longer-term securities, which subsequently has contributed to an uptick in term premiums toward normalized levels.

On the front of inflation, Yellen conveyed her outlook with a seasoned optimism. She expressed that although the deceleration of inflation hasn't made significant strides in recent months, she remains convinced that prices are operating within a declining trajectory. Yellen posited that the labor market is not a primary instigator of inflationary pressures. She explained that even though the pace at which inflation is subsiding may be gradual, the overall trend seems to be favoring a downward movement. This optimistic viewpoint not only reflects her confidence in the underlying economic strategies but is also indicative of the broader commitment to ensuring price stability over the long haul.

Perhaps more critically, Yellen expressed considerable trepidation regarding the mounting fiscal deficits. She underscored that the incoming administration must prioritize and earnestly tackle the issue of fiscal responsibility. Yellen articulated her hopes that the Treasury market would not echo the tumultuous behavior seen decades ago during periods of rampant market fluctuations. She defined the present sentiment among global investors, who anticipate that the U.S. will manage its fiscal policies with prudence, rather than relying on the erratic responses of the marketplace to ameliorate deficits. Such a reliance could potentially introduce an array of unpredictable risks to economic stability, given the unpredictable nature of market reactions and their lagging responses.

Addressing the U.S. government's proposed strategy of deficit reduction through expenditure cuts, Yellen voiced her skepticism. She provided the insight that beyond the areas of defense and welfare—two sectors heavily weighing on fiscal expenditures—the room for further cuts is exceedingly limited. Defense spending is intrinsically tied to national security and strategic interests, making sweeping cuts impractical; similarly, welfare programs represent vital interests for large segments of the populace. Yellen also brought into question the efficacy of the so-called "Government Efficiency Office," stating the absence of clear frameworks regarding the actual calculations or planning behind improving government efficiency and reducing spending, raising doubts about the real-world impacts of such initiatives.

Reflecting on the inflationary challenges faced by the democratic administration in years past, Yellen attributed the widespread price increases largely to the pandemic-induced supply shocks. The onslaught of COVID-19 significantly disrupted global supply chains, creating shortages across various commodity sectors and propelling prices upward. This analysis sheds light on the multifaceted nature of inflation in the current context and presents a refreshing perspective on the challenges that arose during the pandemic’s peak.

Finally, Yellen shared her upcoming plans post-tenure, revealing her intention to take some time off for a vacation, allowing herself a reprieve from the intense pressures of her long career in public service. Following her well-deserved break, she will return to the Brookings Institution to assume various roles. This next chapter not only signifies her transition from government to a think tank environment but also reflects her enduring commitment to leveraging her extensive expertise to contribute to research and policy formulation affecting the U.S. economy—an effort aimed at bolstering the path toward stable economic development.

In summation, Yellen's insights during this interview provided a thorough and articulate exploration of the pressing themes surrounding Treasury bond sell-offs, shifting interest rate expectations, inflation challenges, and fiscal deficits. Her viewpoints not only encapsulate the current state of the U.S. economy and its myriad challenges but also furnish invaluable reference points for future economic policymaking by the government. Ultimately, her disclosures serve as a crucial framework for understanding the complexities of the American economic landscape and the dire need for prudent fiscal stewardship moving forward.